Richard Joiner, Kim Issroff and John Demiris advocated for using a visual representation of where teammates among a group went during a collaborative foraging task. They claimed that this could provide a visual way to represent a collaborative search strategy; e.g for instance a clear division of labor or not. However, they also mentionned some problems:- these maps do not represent many of the interesting features of human-human collaboration (nature of the interactiona between the participants: a pair could simply took turn rather than working collaboratively, their trace diagram could show little backtracking and overlap, but this would not have been as a result of their collaboration) - it is important to aupplement this analysis method with others to provide a fuller description of their interaction - trace diagrams do not accurately represent time and duration. It could be possible to have a number of trace diagrams for different periods of time, but using this method would make it difficult to get an overall picture of the interaction

"Comparing Human-Human and Robot-Robot Interactions", R. Joiner, K. Issroff and J. Demiris, in "Collaborative Learning: Cognitive and Computational Approachers", Pierre Dillenbourg (ed), pp 81-102, Pergamon Press (Elsevier Science), 1999.

I should also check Joiner R. & Issroff, K. (2003). Tracing success: graphical methods for analysing successful collaborative problem solving. Computers & Education, 41, 4, 369-378.