[1] P. Agre, D. Chapman, Pengi: An implementation of a theory of activity, in: Proceedings of the Sixth National Conference on Artificial Intelligence, AAAI Press, Anaheim, CA, 1987, pp. 268--272.

[2] J.F. Allen, G. Ferguson, Actions and events in interval temporal logic, Journal of Logic and Computation 4 (5) (1994) 531--579.

[3] I. Androutsopoulos, G.D. Ritchie, P. Thanisch, Natural Language Interfaces to Databases---An Introduction, L. Steels, J.-C. Baillie / Robotics and Autonomous Systems 43 (2003) 163--173 173 Cambridge University Press, Cambridge, Journal of Natural Language Engineering 1 (1) (1995).

[4] N. Badler, M. Palmer, R. Bindiganavale, Animation control for real-time virtual humans, Communications of the ACM 42 (8) (1999) 64--73.

[5] J.-C. Baillie, J.-G. Ganascia, Action categorization from video sequences, in: W. Horn (Ed.), Proceedings of the ECAI 2000, IOS Press, Amsterdam, 2000.

[6] J.-C. Baillie, Apprentissage et reconnaissance d'actions dans des sequences video, Ph.D. Thesis, Universite de Paris.

[7] J.-C. Baillie, Object tracking using certainty color maps, in: Proceedings of the ECCV'2002, submitted for publication.

[8] R.A. Brooks, Intelligence Without Representation: Artificial Intelligence Journal 47 (1991) 139--159.

[9] H.H. Clark, S.A. Brennan, Grounding in communication, in: L.B. Resnick, J.M. Levine, S.D. Teasley (Eds.), Perspectives on Socially Shared Cognition, APA Books, Washington, 1991.

[10] P. Cohen, et al., Proceedings of the AAAI Spring Symposium on Grounding, AAAI Press, Anaheim, CA, 2001.

[11] S. Coradeschi, D. Driankov, L. Karlsson, A. Saffiotti, Fuzzy anchoring, in: Proceedings of the IEEE International Conference on Fuzzy Systems, Melbourne, Australia, 2001.

[12] A. Elfes, Using occupancy grids for mobile robot perception and navigation, Computer 22 (6) (1989) 46--57.

[13] S. Harnad, The symbol grounding problem, Physica D 42 (1990) 335--346.

[14] Y. Kuniyoshi, H. Inoue, Qualitative recognition of ongoing human action sequences, in: Proc. IJCAI-93, 1993, pp. 1600-1609.

[15] N. Nilsson, Artificial Intelligence: A New Synthesis, Morgan Kaufmann, Los Altos, CA, March 1998.

[16] L. Shapiro, G. Stockman, Computer Vision, Prentice-Hall, Englewood Cliffs, NJ, 2001.

[17] J. Siskind, Visual event classification through force dynamics, in: Proceedings of the AAAI Conference 2000, AAAI Press, Anaheim CA, 2000, pp. 159--155.

[18] D. Sperber, D. Wilson, Relevance: Communication and Cognition, Harvard University Press, Cambridge, MA, 1986.

[19] L. Steels, Language games for autonomous robots, IEEE Intelligent Systems (2001) 16--22.

[20] L. Steels, Simulating the origins and evolution of a grammar of case, in: Proceedings of the Evolution of Language Conference, Harvard, April 2002, in press.

[21] L. Steels, F. Kaplan, AIBO's first words, The social learning of language and meaning, Evolution of Communication 4 (1) (2001).

[22] L. Steels, F. Kaplan, A. McIntyre, J. Van Looveren, Crucial factors in the origins of word-meaning, in: A. Wray (Ed.), The Transition to Language, Oxford University Press, Oxford, UK, 2002.

[23] L. Talmy, Toward a Cognitive Semantics: Concept Structuring Systems (Language, Speech, and Communication), The MIT Press, Cambridge, MA, 2000.

[24] M.G. Montoya, C. Gil, I. Garcia, Implementation of a region growing algorithm on multicomputers: analysis of the work load balance, in: Proceedings of the AI'2000, Canada, 2000.