Show me how you act on a diagram and I'll tell you what you think (or: Spatial Structures as Organizing Schemes in Collaborative Human-computer Reasoning)

Collaborative human-computer reasoning creates asymmetric reasoning situations in which the human and the computational partners possess dissimilar and, to some extent, even incomparable reasoning faculties. In order to produce a satisfactory performance, collaborative humancomputer reasoning requires that predictive cognitive processing models of the human reasoning partner are integrated with the computational part. Keeping track of cognitive process flows thus becomes essential. To this end, basic spatial mechanisms are suggested for control of focus in reasoning with diagrams, and they are complemented by other approaches