%P 141-157 %C Szeged %O Bibliogr.: p. 156-157. ; ĂśsszefoglalĂĄs angol nyelven %T CD grammar systems and trajectories %J Acta cybernetica %A Mateescu Alexandru %N 2 %D 1997 %L acta12583 %K SzĂĄmĂtĂĄstechnika, Kibernetika %V 13 %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.