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. Authors-'biographies, R. Vincent, and . Born, he is working on image processing , multi-agent systems and computer simulation of biological processes. Gireg DESMEULLES was born in 1979 Lecturer at Brest National Engineering School (France), he is working on virtual reality, multi-interaction paradigm and in virtuo experimentation. Pascal BALLET was born in 1971. He has studied at Brest National Engineering School (France) He is currently lecturer at University of Brest (France) and he is wor king on multi-agent systems and computer simulation of biological processes. Pascal REDOU was born in 1971, Lecturer in applied mathematics at Brest National Engineering school (France), he is working on consistence and stability of multi-agent algorithms, and on coupling differential and multi-agent systems, 1966.

L. Christophe and . Gal-was-born-in, He is associate professor in computer sciences at Brest National Engineering School (France), and COO of CERVVAL company. His domain of interest is numerical simulation methods for virtual reality, 1972.