Learning to teach scientific practices: pedagogical decisions and reflections during a course for pre-service science teachers
© Saribas and Ceyhan; licensee Springer. 2015
Received: 4 September 2014
Accepted: 16 April 2015
Published: 29 April 2015
This auto-ethnographic study describes research conducted in a science teacher education program at a state university in Turkey, where I had taught the ‘laboratory applications’ course for the four previous years. While the students learned the basic skills needed to implement a laboratory course, I detected some deficiencies in their understanding of scientific practices. Consequently, I decided to adopt a different approach. In the fall of 2013 to 2014, I participated in a project aimed at improving pre-service science teachers’ understanding of scientific practices (SPs) using a model known as the Benzene Ring Heuristic (Erduran and Dagher 2014).
This project helped me to re-design my course, emphasizing the integration of SPs into lesson planning and teaching. As I taught the re-designed course, I gathered data from various sources, including pre- and post-interviews, audiotape recordings of lessons, students’ lesson plans and reflections, and my own and my colleague’s reflections after teaching.
The data suggest that my students’ understanding of SPs improved, but I was still not satisfied with their understanding of domain specificity, ethics, and utility in science, or with their beliefs about the roles and responsibilities of students during science lessons. These are issues to be dealt with as I continue to try to improve the course.
KeywordsAuto-ethnography Scientific practices Professional development Pre-service teacher education
I completed my PhD in the spring of 2008, and since the fall of 2009, I have been working as an instructor at a state university in Turkey, teaching pre-service science teachers the methodology of science teaching. The purpose of my courses has been to further their understanding of science and the scientific method and to enable them to design and implement science lessons. Currently, the goal of my ‘laboratory applications’ course is to provide pre-service science teachers with the analytical and communicative skills needed to design and implement laboratory instruction. In the content of this course, I introduce science process skills and inquiry-based instruction. Furthermore, I present various pedagogical approaches, from a verification approach to an open-inquiry lab, while asking questions and offering opportunities for cooperative and collaborative learning.
They regarded the scientific method as a step-by-step procedure beginning with a question and ending with results, despite my emphasis on the iterative nature of science as opposed to a recipe-like procedure.
All my students included communication skills in their lesson plans (LPs) and discussed them in their reflections. However, the discussion part of their reports contained very limited information about discourse or discussion in teaching. They noted only that the students discussed their views during classroom activities. Moreover, they showed little or no understanding of the role of discourse and social certification in the scientific process.
Most of the pre-service teachers regarded science as including mainly observation and/or experimentation, and they underestimated the significance of modeling in scientific work even though I had discussed modeling during the lessons. Only one group out of ten used modeling in their first LP.
My students exhibited the misconception that scientific activities aim to verify facts, concepts, and hypotheses. Even after I had introduced different pedagogical approaches, science process skills, and inquiry, and after their implementations of LPs, one of my students declared that experiments and models are made to verify information. This misconception may have arisen from the traditional science courses that she had taken. It is evident that the different pedagogical approaches presented in the course had not removed this misconception.
Such problems led me to conclude that I needed a new approach in my teaching. I also thought that I might find other misconceptions about the nature of science if I probed my students’ thinking.
In recent years, examination of the nature of science (NOS) has led both educators and researchers to discuss ‘the scientific worldview’, ‘science as a way of knowing’, and ‘scientific practices’ (American Association for the Advancement of Science 2009; Duschl and Gitomer, 1991; Lederman 1999; McNeill 1998) and to disseminate the ‘notion of whole science’ (Allchin 2011), which emphasizes the multiple dimensions of science. According to Allchin (2011), the ‘Whole Science approach underscores the role of rendering the integrity of scientific practice’ (p. 526). So what are these scientific practices (SPs)?
Asking questions (for science) and defining problems (for engineering)
Developing and using models
Planning and carrying out investigations
Analyzing and interpreting data
Using mathematics and computational thinking
Constructing explanations (for science) and designing solutions (for engineering)
Engaging in argument from evidence
Obtaining, evaluating, and communicating information (2012, p. 49)
Research concerning SPs in ‘Taking Science to Schools’ (TSTS) (National Research Council 2012) showed that children increase their capacity for complex reasoning and develop their cognitive ability when they are engaged in SPs such as predicting, observing, testing, measuring, counting, recording, collaborating, and communicating. TSTS (National Research Council 2012) also concluded that SPs widen students’ knowledge and understanding of scientific concepts and principles (cited in Duschl and Grandy 2013).
Although the essential components of SPs are well known and thoroughly discussed in the literature, there may be different ways to indicate the relationships between these components, one of which is represented in the Benzene Ring Heuristic (BRH) designed by Erduran and Dagher (2014).
Benzene Ring Heuristic
The benzene ring is an organic compound that consists of six carbon atoms and six hydrogen atoms joined together in a ring with single and double bonds. The heuristic shows epistemic and cognitive aspects of science that are interrelated and influenced by social dimensions in a holistic illustration. The epistemic components are linked to one another by dynamic socio-cognitive processes represented by the electron cloud, indicating representation, reasoning, discourse, and social certification (Erduran and Dagher 2014).
A significant contribution of this heuristic is that science process skills that are fundamentally different aspects of science are no longer isolated but included in the same illustration by showing their interactions within other SPs (Erduran and Dagher 2014). I was impressed by this heuristic in my search for a way to develop pre-service teachers’ thinking about science, and I decided to introduce BRH to the students in my course.
My aim here is to present my interpretations of teaching a holistic approach to science using BRH and to bring my perspective of teaching and learning science into the realm of educational research. More specifically, the problems I found in my students’ reasoning about science and the scientific process led me to conclude that I should implement a new approach to answer the following question: how can I improve my teaching in order to develop pre-service science teachers’ ways of thinking about science by integrating SPs into my teaching? Auto-ethnography, which comprises ‘highly personalized accounts that draw upon the experience of the author/researcher for the purposes of extending sociological understanding’ (Sparkes 2000, p. 21), is an appropriate method for this task.
With the advent of post-modern research, ethnographic and auto-ethnographic writing practices have gained in favor (Holt 2003; Reed-Danahay 1997). Although there are various definitions of ethnography, ethnography in education specifically is defined as ‘research on and in educational institutions based on participant observation and/or permanent recordings of everyday life in naturally occurring settings’ (Delamont and Atkinson 1980, p. 139). On the other hand, auto-ethnography in education is taken to be a form of self-reflection that aims at presenting a teacher-educator’s subjective experience as a researcher, combining this narrative with theoretical frameworks of wider phenomena (Hamilton et al. 2008). According to Ellis and Bochner (2000), auto-ethnographic studies differ in the sense that they emphasize the ‘auto’ (the self), ‘ethno’ (cultural elements), and ‘graphy’ (the research process) (as cited in Reed-Danahay 1997). From this perspective, Ellis and Bochner (2000) considered auto-ethnography as ‘exposing a vulnerable self that is moved by and may move through, refract and resist cultural interpretations’ (p. 739). From Ellis’s perspective (2004), the cultural component is crucial in auto-ethnographic research and ‘in an educational context, culture could be addressed as language, action, and/or interaction’ (Hamilton et al. 2008, p. 23).
There are two types of auto-ethnography, each with a different purpose. According to Ellis and Bochner (2000), the mode of storytelling in evocative auto-ethnography ‘is akin to the novel or biography and thus fractures the boundaries that normally separate social science from literature’ (p. 744). According to Anderson (2006), analytic auto-ethnography is characterized by ‘(1) Complete member researcher, (2) Analytic reflexivity, (3) Narrative visibility of the researcher’s self, (4) Dialogue with informants beyond the self, (5) Commitment to theoretical analysis’ (p. 378).
This paper takes the form of analytic auto-ethnography. I will describe the method of the study, how I decided to improve my teaching, how I implemented the heuristic of SPs into my teaching, and what happened during the lessons.
With the aim of implementing a new approach to my teaching, I participated in a project entitled ‘Revisiting Scientific Inquiry in the Classroom: Towards an Interdisciplinary Framework for Science Teaching and Learning’. It was supported by TUBITAK and the European Union Marie Curie Co-Funded Brain Circulation Scheme Fellowship (291762/2236) and was offered at a state university in Turkey. The aim of this project was to investigate the impact of an intervention based on a heuristic of scientific processes on pre-service teachers’ perceptions and reasoning. The heuristic is based on an interdisciplinary account of SPs and draws on the relationships between the various epistemic, cognitive, and social features of SPs. Components of the heuristic include (a) epistemic components such as scientific activities (classification, experimentation, and observation), data, model, explanation, and prediction; (b) cognitive components such as representations and reasoning; and (c) social components such as discourse and social certification of scientific claims.
With the help of this project I undertook the procedure of implementing SPs on BRH to improve my teaching for developing my students' understanding science. The project recommended the inclusion of three workshop sessions in a course, each of which would last for approximately three hours. The course normally had three lecture hours and two lab hours per week. I conducted the lecture sessions, and the second author, the course assistant, conducted the lab sessions. Previously, the second author had worked as a middle school science teacher for eight years. In our lab sessions, she helped the pre-service teachers to search the web for sample LPs, and when they were about to teach, she helped them to prepare their lessons.
Thirty-six pre-service teachers participated. They were divided randomly into two sections, one in the morning (n = 23), the other in the afternoon (n = 12). The second author attended the morning sessions, and the coordinator of our project attended most of the sessions as an observer. The course was taught in English, which for the students is a second language.
This course was designed in two phases, the first of which includes introducing and discussing science process skills and inquiry, and the second phase of which consists of asking questions during instruction and cooperative and collaborative learning. Both phases ended up with pre-service science teachers’ implementation of their LPs that they designed with their teammates in microteaching hours. After their microteaching experiences, they submitted their reports of LPs including their individual reflections.
At the beginning of the course, pre-service teachers were asked to form groups of three or four pre-service teachers to design and implement a lab lesson on a science topic. In the first phase of the course, safety, science process skills, inquiry, and different pedagogical approaches, ranging from a traditional teaching approach to the open-inquiry type of instruction in science teaching, were introduced throughout three weeks, and in the following three weeks, pre-service teachers presented their LPs in groups in microteaching hours. Then they submitted their group reports of these LPs including an individual discussion part in which they reflected the theoretical information they integrated into their plans as well as their experiences during microteaching hours.
In the second phase of the course, asking investigable questions during instruction was introduced to pre-service teachers and increasing the inquiry level of the instruction was discussed by using these questions in previous years. In the following week, the importance of collaboration and cooperation in science and science education was discussed. In this phase, pre-service teachers were responsible to choose a science topic other than their first LPs and again design and implement a lab lesson. Then they submitted the group reports of their LPs in groups again including an individual discussion part.
I gathered data from various sources, including pre- and post-interviews, audiotape recordings of lessons, students’ LPs and reflections, and my own and my colleague’s reflections after teaching.
Results and discussion
In this section, I will analyze the problems that I observed before the intervention, the use of BRH to solve the problems, and the change in the understanding of students upon implementation of the BRH in workshop sessions.
How I decided to improve my teaching
In this course, I learned how a laboratory lesson plan is prepared well and its specific characteristics. Laboratory work can be different kinds of inquiry levels based on students’ cognitive and developmental skills. If we increase the inquiry level of lesson, we should provide more usage of students’ basic and integrated process skills. However I learned laboratory work should be related with the class work and emphasized hypothesis, predicting, developing concepts, model building and developing positive attitudes toward science. If our lesson style allows students to make their experiment by observing, inferring, measuring, classifying, predicting and communication, their science skills will be developed. That means students’ practical, inquiry and teamwork skills should be developed.
Students measured the time by adding yeast solution to the tubes (measuring) and after waiting for a while they observed the color change in the tubes (observing)… students thought about the reason of the color change in the tubes (predicting) and also at the end, they found the reason why these materials used in the experiment (inferring). In the discussion part of the experiment, they shared their ideas with each other… (communicating). Besides the basic science process skills we also used some integrated science process skills in our lesson such as experimenting and fair testing and control of variables. We did experimenting because in experimenting, there is an investigation by trial and error. In our lesson, students made some investigations by adding some materials to the tubes. In addition, we used fair testing and control of variables. That is, we had dependent, independent and control variables in our experiment.
I inferred from their reflections that they could list and discuss the basic skills of observing, measuring, predicting, inferring, classifying, and communicating, and the integrated skills of hypothesizing, identifying and controlling variables, defining operationally, designing experiments, analyzing data, and interpreting results. However, understanding science is not only a matter of identifying and explaining the components of scientific processes. It also includes a holistic understanding of domain specificity in science, the role of social discourse and social certification in a scientific process, and ethics in science.
Before the intervention, when asked to represent their understanding of SPs, four out of nine groups drew a linear sequence in the following order: ask a question, determine the problem, collect data, construct a hypothesis, test the hypothesis, analyze the data, and communicate the results. Their drawings revealed their lack of a holistic understanding of science. Also, only one student in all the pre-course interviews had mentioned discourse or social interaction when asked to list the components of SPs.
Before beginning this study, I had never thought about probing my students’ views about ethics and utility in science. After my students brought up ethical issues during their interviews, I thought that I should also consider ethics when re-designing the course. An interviewee in her pre-interview said that one feature of SP is to follow the proper ethical rules. I thought that she was right and that I ought to discuss this issue during my teaching.
Realizing that my students lacked a holistic understanding of SP, I decided in the fall semester of 2013 to 2014 to participate in the above-mentioned project. The heuristic that was used in this project aroused my interest because science literature has long emphasized the generalizations of scientific method and claimed that there is no one way for doing science, no universal step-by-step recipe-like procedure (Abd-El-Khalick 2012; Duschl and Grandy 2013; Lederman and Adb-El-Khalick 1998). For this reason, science education must be grounded in a holistic approach in which students recognize that scientific methods are diverse and that the essence of science is the accumulation of evidence in support of claims.
There has been a debate about the characterization and teaching of science over the last decade. Two different positions have emerged in this debate: Version 1 advocates that science should be taught using domain-general and consensus-based aspects of the NOS; version 2 says that science is characterized by cognitive, epistemic, and social practices, and that science should be taught by engaging students in domain-specific practices. According to version 2, students learn to use these practices when developing evidence-based explanations and when communicating ideas (Duschl and Grandy 2013).
Discourse practices of science, such as argumentation, modeling, and critiquing, are central in version 2, while these practices are missing in version 1 (Duschl and Grandy 2013). This is why I favored the position of version 2 and decided to incorporate it into my teaching. Furthermore, included in the dimension of reliability in SP are ethical considerations (Allchin 2011). I wanted my students to consider and appreciate ethics in science.
How I implemented the heuristic of SPs into my teaching
At the beginning of the fall semester of 2013 to 2014, the students were asked to form groups of three or four, and each group was given the assignment of planning and implementing two microteaching lessons. After introducing the theoretical background to a selection of pedagogical approaches, science process skills, and inquiry, the second author and I gave each group a topic for the first LP, recognizing that this would be the students’ first microteaching experience in a teacher education program. After the groups had designed and implemented their LPs, their classmates and I gave them feedback in terms of science process skills and inquiry levels, and then they wrote their own reflections about what they had done. During this time, we conducted pre-interviews with ten of the pre-service teachers for the purpose of recording their perceptions and ideas about SPs. I will provide sample statements from those interviews in the next section of this paper.
After the first microteaching presentations, we implemented the workshops, and following these workshop sessions, my students presented the second of their LPs, this one on a topic their group had chosen (Additional file 1: Appendix 1).
What happened during the sessions?
Before introducing SPs, but after teaching the topics of science process skills - inquiry, instructional types, and pedagogical approaches - I asked the pre-service science teachers in their groups to construct a concept map to show their understanding of SPs. After the intervention, they constructed a second map to record a change in their understanding, both of SPs and the BRH.
I learned what scientific practices are and how we can apply them in our lessons. That is, there are various scientific practices and each of them can be a part of our lesson. There are also some relationships between these scientific practices and they form content of the lesson. Therefore, when I create a lesson plan, I can teach a subject to students in a more effective way by using them.
One of the students defined the heuristic as ‘having a continuous relation and this relationship specifies the format of instruction’. However, some could not comprehend the continuity of the heuristic and asserted that the ‘benzene shape provides the basic titles; however the path teacher may follow should not be restricted. Teacher and candidates should change the order and jump to one scientific practice to another. Benzene shape should include flexibility’.
Some were confused about the components of the heuristic and had difficulty in applying it to the activity. For instance, one student stated ‘At first glance, I couldn’t understand the concept of modeling and data. Therefore, I said that modeling is not necessary and we can remove it from our microteaching’.
I realized that it is important to make lesson plans including appropriate scientific practices so that it can facilitate learning for students.
The entire lecture showed me using scientific practices was useful for students to capture their perceptions toward topic.
I found these reflections encouraging. The session ended with reinforcement of the interconnection between the components of SPs.
Lesson planning should be very structured and every step has the aim. Introduction, activity and conclusion play a vital role in lesson planning. In group work, modelling part become more comprehensible. Prediction may appear in every part of the activity. Experiences, real world and lesson is effective for students and also science education. Predictions shape the understanding of real world and real world shapes predictions. Whether the conclusion is right or not, it is more important to comment conclusion and to discussion in a right way.
The sample pre-intervention concept map shows that these pre-service teachers were able to indicate the relationships between the components of SPs in a part linear, part circular representation. This representation shows a circular relationship between the scientific activities of observing, data gathering, and questioning, but a linear relationship between those of data gathering, predicting, and modeling. However, the post-intervention concept map shows that after the intervention, they were able to demonstrate the holistic approach in a circular representation associating the cognitive (explanation), epistemic (model making), and social (argumentation) aspects of science (Erduran and Dagher 2014) in a circular manner.
When the second author and I were explaining and comparing my students’ concept maps in class, they emphasized the change in understanding of the sequence of SPs in the BRH. After participating in the acid-base activity and the classroom discussion about different pedagogical examples, my students were more aware of the divergent use of SPs. One of the pre-service science teachers claimed ‘BRH helps the teacher to prepare a better and organized lesson plan’.
In the second microteaching performance, which took place after the workshop sessions, the pre-service teachers were required to use the components of the BRH. Most of the groups used modeling, since it was new for them, a departure from their earlier idea that experiment is the only kind of scientific activity. Comparison of the two microteaching performances made it evident that the BRH had helped them be more organized in the second performance, and the difference was noted in their written reflections. Furthermore, the opportunity to apply the BRH in microteaching broadened their understanding of SPs and the incorporation of SPs into lessons, because they had become aware that each LP employed a different type of application.
Holistic understanding of SPs
The students who had drawn a linear sequence of the scientific method in their first concept maps - ask a question, determine the problem, collect data, construct a hypothesis, test the hypothesis, analyze the data, and communicate the results - represented SPs as a circle in their second concept maps, specifically about acids and bases. They identified real-world phenomena (referring to commonplace objects such as salt, soap, lemon, and orange), predictions, models, activities (observation and experiment), data (gathered from the experiments by using litmus paper), explanation (numerical values of acids and bases), and social certification (represented by a smiling sun) as SPs.
One of the students explained her opinion about the scientific practices as they help to teach a subject to students in a more effective way. In addition, they learned the Benzene Ring Heuristic showing the relationship among scientific concepts. …
In the second session, the instructor introduced different lesson plans that are based on different pedagogical strategies and wanted them to differentiate the scientific practices that are used. The students were able to determine the scientific practices used in the samples and had a better understanding about the use of BRH. They were also asked to think of different ways to plan these lessons by using different scientific practices or in different order. This session helped students to make it clear for the application of BRH in different subjects and for the correction of confusions of the students about the order of the scientific practices.
In the last session, students created the second concept map in order to observe the change in the understanding of the scientific practices and BRH. When they were explaining their concept map and the comparison with the first one, they mostly put emphasis on the change in the understanding about the sequence of the scientific practices in the benzene ring model. After the application of the acid-base activity and the classroom discussion about different pedagogical examples, they realized the divergent use of scientific practices. They expressed that BRH helps the teacher to a better and organized lesson plan.
Real world, explanation, data, activity, prediction, discussion and modeling are what we call scientific practices. The order of these steps can be changed and some steps can be omitted, based on the topics and the conditions of classroom.
Before planning our instruction, we didn’t specify which scientific practice will be the first and which one is going to follow it. We only decide what we can do and which scientific practice we can use. While doing the activity everything became clear. BRH facilitates the understanding of the activities, planning and outlining the lesson.
I can say that these three sessions were useful for me to understand what BRH and scientific practices were. I realized in most of the activities we can use BRH. The components do not follow a sequence and we can start from any point. For example, while conducting an experiment we can start from the real world and while conducting another we can start from prediction.
There are various scientific practices and each of them can be a part of our lesson. There are also some relationships between these scientific practices.
I learned the following scientific practices in this course: Explanation, activity, data, real world, prediction, model and discussion/argumentation. We learned these practices and their interrelationships with each other and how to use these in our lab lessons effectively.
Before three sessions, which are related to scientific practices, I supposed that scientific practices such as activity, explanation, and modeling can depend on each other. In addition, I think these practices are shaped step by step and places of scientific practices cannot be changed. After three sessions, I understand that scientific practices are like benzene heuristic. These cannot depend on each other. Scientific practices used in activity can be changed according to topic, age of students and level of students.
After they had learned about BRH as a heuristic, I was expecting all the students to show all the components of SPs in some form of circular representation. Nevertheless, at the end of the treatment, only one person retained the concept of a linear sequence of SPs - ‘Problem (or question), observation, recording data, prediction, and communication.’ The change in the students’ thinking about SPs shows that the intervention had had a positive influence.
In physics, experiments are more widely used than in biology. In biology, for example, evolution depends on modeling. There’s no chance for experimentation. However, physicists can establish systems by answering questions of how the universe exists, the origin of matter, etc., and make experiments.
In physical sciences we construct hypotheses and make experiments and measurements and record these measurements to prove the hypotheses. There is also a social certification process. However, in social sciences, e.g. we make experiments on human beings. There is no need to use any tools.
His explanation reveals a lack of understanding. For this reason, I thought that I should emphasize the issue of domain specificity in subsequent lessons.
The epistemic components of SPs
In order for your practices to be considered in scientific enterprise, it has to be approved by other scientists, so scientific practices have to include social certification.
The high number of concepts that the participants used surprised me. During the interviews, the interviewees listed very limited number of components of scientific practices. However, the participants in this session used most of the components of the scientific practices in the concept maps they made. They used most of the concepts of scientific practices, but 3 groups mentioned curiosity and 4 groups included the component of asking questions in the concept map they made in addition to the concepts in BRH. One group used the concept of argumentation in the concept map they made. When we ask where they heard it, they told that they remembered it from the model they made individually during filling the questionnaire.
This session was designed to help pre-service teachers adapt BRH to lesson planning. The students knew how to design a lesson plan. For this reason, they didn’t have any difficulty drawing an outline of a lesson plan. The explanations they made about scientific practices, which the students may use in this lesson plan, showed that they gained a general understanding of scientific practices and BRH.
After the workshops, all the students identified and discussed the SPs they had used in their LPs. I was glad to see that they emphasized the real world as a component of SPs, indicating that they understood that science deals with real-world phenomena.
It is interesting that although the participants in each section used most of the scientific practices in the activities they designed none of them used models even though they knew that it is one of the scientific practices. This situation made me think that we should emphasize modelling more in science teaching courses.
They were required to use BRM in their second microteaching performance. Most of the groups used modeling, as it is included in BRM and it is new for them, which was because they used to think experiment as the only way for a scientific activity. When comparing the two-microteaching performances, they were more organized by using BRM in the second performance.
Describe how you make sound from your materials (Materials: Plastic plate, box, tack, packet, rubber band, bead, colorful rope, 2 bottles, toilet paper roll, sellotape).
For these microteaching sessions we chose three musical instruments as models and discussed what we would need to produce sounds based on the range of vibrations and frequencies of these instruments.
If there would be more time than we had, another activity that is observing DNA samples on microscopes can be added. Afterwards, students would draw the picture of what they would see and this could be considered as modeling.
I thought that modeling is waste of time before this course, because I didn’t believe that my students could be creative in this way. My opinions changed after this course, because we saw some examples of experiments including scientific practices.
If I do same task now, I would add some practices like prediction and modeling. I would ask students to drop iodine in to egg and milk and ask “What do you observe? Do you predict any color changes?” I would ask them to draw a rectangle and different types of food (i.e. fruits, vegetables, chocolate, milk-product, meat, bread etc.) and identify which are healthy and unhealthy.
If I do the same task now, I would include modeling in my instruction. I would construct a three-dimensional shape of a protein molecule.
I would add a review of other scientific studies if I do the same task now because it may help students to understand the progress in information about buoyancy of liquids. We may also discuss the validity of the principle of Archimedes. Other studies that are done by other scientists may also give a different point of view.
Experiments should include measurable variables, as we learned from the course. Activities are easier things to entertain the students. However, observing the lens of the eye, well it may be disgusting for them, but it’s a more sophisticated task. It can be regarded as an experiment. There’s not any measurable thing here. It becomes an experiment as it gets complicated. There was nothing to be measured but I think measurable things can be added. Actually I don’t want to say that the activities cannot be measured and experiments can be measured. They are a continuation of each other”.
This pre-service teacher seems to be very much confused. He distinguishes activities and experiments by explaining that activities are entertaining, while experiments are more challenging and entail some form of measurement. I decided that we should discuss activities in general and experiments in particular.
The cycle in BRH
I think these practices make a lesson easier according to both the teachers and the students. Because the teachers know what or how they teach or what they make emphasis by using practices. Also the students understand the topic because the teachers follow the steps of scientific practices. I infer, myself, that scientific practices are really useful and beneficial for both students and the teacher.
The lesson started without any problems and I didn’t encounter any obstacles until I introduced the pre-service science teachers to the BRH. After we discussed the BRH in the classroom I asked the students to link the ideas in the model to the acids and bases activity that they had just completed. Some students mentioned their confusion about the circle in the center of the hexagon. They thought that the arrows of the circle had a sequence and moved in a clockwise direction. I had never thought of this probable misconception arising from the model. At that moment the coordinator of our project (who was observing) interrupted the instruction and clarified the representation of the model by explaining the analogy of the electron cloud of the benzene ring and the circle in the model. From then on there was no question about the model in the participants’ mind. In the second section I was careful to avoid this kind misconception.
The students defined the heuristic as having a continuous relation and this relationship specifies the format of instruction. However, some students were confused about the components of the model and had difficulty applying it to the activity. Some of them considered the components as sequential and didn’t pay attention to the components in the center of the hexagon.
During the post-interviews, two pre-service teachers described their readiness to use the BRH for designing a LP. However, they also expressed confusion about the circle in the heuristic. I think that one can avoid this confusion by drawing the arrows in two directions. Despite the confusion, I think the heuristic was useful in stimulating discussion, and what I learned I used in subsequent lessons, during which I emphasized the bi-directionality of the arrows.
Ethics and utility
At the beginning science is not concerned about ethics. However, after encountering some problems like nuclear events… people asked questions, rightly, such as “Will you make nuclear weapons?” or about cloning, “Why do you do that?” These practices can harm people. Afterwards science began to be concerned about these ethical issues.
This statement implies an opinion that scientists neglect ethical issues while asking scientific questions and consider the ethical implications only after some problem has emerged. She had already conveyed the opinion that the goal of science is to be useful to people. Perhaps this opinion led her to the conclusion that scientists sometimes fail to consider ethical issues at the beginning of their work and later have to confront the ethical consequences. In total, only three students raised the question of ethics; nevertheless, their opinions are worth noting.
Students as scientists
From the beginning of the semester, we have been discussing the benefits of inquiry-based activities by which students ‘develop knowledge and understanding of scientific ideas, as well as an understanding of how scientists study the natural world’ (National Research Council 1996). However, I learned that my students did not all adopt this view.
This session aimed at helping the pre-service science teachers to discuss scientific practices that can be used in various lesson plans employing different pedagogical strategies.… In the morning session the participants discussed their plans regarding pedagogical strategies and scientific practices in lesson plans. Basically, two different views arose from the discussion. One group thought that lab sessions should be designed so that students would be active and the teacher would be a guide. The other group maintained that a primary grade student cannot design his/her own procedure without a teacher’s input. This conflict between the two groups lasted until the end of the session. However, one participant agreed with neither of the two groups. She argued the necessity of creating opportunities for students to discuss their own ideas and to make decisions but added that the teacher should also give explanations during lab sessions.
I witnessed a similar conflict when the students were drawing concept maps after the workshops. Two discussed the students’ role in learning. One young man claimed that students are little scientists, but his teammate opposed him. She thought that the students should discuss their arguments after their predictions, activities, and data gathering, and then should explain their results. He agreed with her except for the addition of a ‘peer review experience’. He came up with the idea that students should have to explain and review their data before discussing their arguments just as scientists do, because the students are little scientists. However, his teammate found this view ridiculous. They did not resolve their differences and decided to show both views in their concept maps.
P1: Don’t they (the students) have a discussion like scientists?
P2: I mean, let’s plan this like a science teacher conducting an activity in the classroom.
P1: Okay. But students should discuss their results with each other. And this time his/her friend becomes another scientist. I think this is very important.
P2: I don’t agree with the idea that students become scientists when they discuss their results. I think we should draw two different ways after this point. I think it is ridiculous; you are creating a lab activity. Does a student’s friend become a scientist?
P1: Yes, of course, a little scientist.
One of the goals of science education is to enable students to engage in scientific tasks just like scientists investigating the natural world. For this reason, one might think of students as little scientists, as one of my students advocated. However, his classmate repudiated this view. I suspect she would not appreciate the process of peer review in lab sessions. As for my point of view, I think I should give more time for discussion of the students’ role in the science classroom.
With an ‘auto-ethnographic gaze’ as I ‘zoom backward and forward, inward and outward’ (Ellis 2004, p. 37) between my students and myself throughout this process, I can say that I as a teacher benefited from the course. As it progressed, I learned how to help these pre-service science teachers to a more comprehensive understanding of SPs and a better understanding of each epistemic component of SPs by acting as a ‘complete member researcher’ (Anderson 2006, p. 378). However, despite the benefits derived from their feedback and discussions of the BRH, I did not successfully teach them about domain specificity, ethics, and utility in science - or how to treat their students as little scientists. More time can be allocated for discussion of these issues in the future. One semester may not be enough to do justice to all the issues that have arisen in this course. Some I will take up in a second semester course (to be taken by the same students), which will concentrate on the NOS.
Considering my subjective experience as a researcher (Hamilton et al. 2008), I have decided to start this course next year by asking students to draw a concept map of SPs, thus their prior knowledge of SPs, and then to go ahead with the three sessions discussed here. During the lecture and microteaching hours, I will deeply discuss the concepts of experiment, observation, inference, and prediction in order to avoid any kind of misconception. After the first microteaching experiences, I will ask my students to reflect on their understanding of SPs in addition to their reports on LPs. Following their LPs, I will ask carefully constructed questions in order to hone the pre-service teachers’ ability to ask high-quality questions that will help their students to engage in scientific tasks, just like scientists investigating the natural world. Then I will discuss disciplinary core ideas to increase students’ understandings of domain specificity. Finally, I will focus on communicating information about social certification in science. Following the lectures, I will ask my students to focus on the quality of their questions, the core disciplinary concepts taught in their LPs, the ways in which their students will communicate information, and relevant ethical issues. After the second microteaching experiences, I will ask them to reflect on their understanding of the issues discussed during lecture hours. At the end of the course, I will ask them to draw another concept map of SPs to illustrate their newly acquired understanding of SPs and of science in general. This design for next year’s course may help me to overcome the limitations of this study and lead me to a broader understanding of my students’ ways of thinking about science.
In summary, the cultural component of this auto-ethnographic study (Ellis 2004) was the interaction with my students, which led me to believe that the course as I designed it contributed to their holistic understanding of SPs as well as their understanding of each specific component. However, integrating SPs by using the BRH in explanations of lesson planning also helped me to see their misconceptions regarding domain specificity, ethics, the utility of SP, and the role of the students in learning science. Awareness of their misunderstanding may lead to continued improvement of my teaching.
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