%D 1997 %O Bibliogr.: p. 156-157. ; ĂśsszefoglalĂĄs angol nyelven %C Szeged %L acta12583 %T CD grammar systems and trajectories %V 13 %A Mateescu Alexandru %K SzĂĄmĂtĂĄstechnika, Kibernetika %N 2 %P 141-157 %J Acta cybernetica %X In this paper we consider constraints, as a new research area for cooperating distributed (CD) grammar systems. Constraints are based on the notion of a trajectory. The flexible approach provides a framework to study some interesting properties of a CD grammar system like fairness or parallelization of languages. The use: of teams in the derivations of words is also considered.