I am considering using the NASA Task Load Index (NASA TLX) to get some insights about our tool in CatchBob!. It's not the core aspect of my research but it might give us some insights about the subjective perception of the workload.

The NASA TLX is a multi-dimensional rating scale for operators to report their mental workload. It uses six dimensions of workload to provide diagnostic information about the nature and relative contribution of each dimension in influencing overall operator workload. Operators rate the contribution made by each of six dimensions of workload to identify the intensity of the perceived workload. The dimensions are 'Mental demands', 'Physical demands', 'Temporal demands', 'Performance', 'Effort' and 'Frustration'.