Table 1.

Task, the feedback given and the proficiency level to be met

	Task	Feedback	Proficiency Level
1	Identify the 4 relevant structures represented at a point in the axilla	Number of structures correctly identified	All four structures identified
2	Follow the course of two of these structures (median and ulnar nerves) from axilla towards the elbow, while keeping the structures in the centre of the virtual ultrasound screen	The amount (%) of the structure represented in the middle of the virtual ultrasound as a proportion of the total length of the structure (from axilla to elbow) (out of 100%)	Mean expert performance
3	Advance a virtual needle towards a specified target (median nerve) keeping the needle in plane during advancement	The proportion (%) of needle advancement which occurred "in plane" as a proportion of the total distance the needle tip advanced in the virtual arm	Mean expert performance
4	Trigger a virtual injectate at an appropriate distance from the target.	The distance from the needle tip to the target structure when injection triggered	Injection at a distance not less than the mean expert minimum distance and not more than the mean expert maximum distance. Needle tip must also be visualized at the time of triggering.