Evaluation. There were two major limitations to KANT : (1) verbosity and exhaustive explicitness of negotiation - although the successive negotiation of parameters and moves could be condensed into a single intervention, such fine-grained mechanisms are nevertheless necessary since rejected offers need to be 'unpacked' in order to determine precisely what is not agreed (speaker?, topic?, dialogue move ?); (2) the absence of natural language understanding capabilities diminishes symmetry (the student cannot participate in explanation) and excludes negotiation of meaning of utterances and domain concepts.
