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Table 2 Information captured in task decomposition table for sub-step A.2.3.6

From: Development and application of a multi-modal task analysis to support intelligent tutoring of complex skills

Description

Move needle under skin to stitch exit location using grasper A

Instructional

Goals

1. Optimal needle orientation and motion

2. Optimal needle depth

CommonErrors

1. Instrument collision

2. Drive needle too deep into tissue

OptimalStrategy

Bring needle tip in contact with the under side of the second target point by supinating hand A wrist slightly (if initial target is on top) or pronating hand A wrist slightly (if initial target is on bottom), maintaining perpendicular orientation and without driving needle too deep into the tissue

Non-optimal Strategies

1. Align needle tip with the under side without supinating dominant hand.

2. Align needle tip without maintaining perpendicular orientation.

Metrics

1. Number of instrument-instrument collisions

2. Time and economy metric

3. Number of instrument movements

4. Instrument path length

5. Number of unnecessary needle punctures

6. Hand orientation

7. Needle driving depth