Abstract L. Groenewegen and E.P. de Vink Operational Semantics for Coordination in Paradigm Paradigm is the modeling language of SOCCA regarding communication, coordination and cooperation. A transition system or STD-based operational semantics for Paradigm is proposed and illustrated with basic producer-consumer examples. The proposed semantics for Paradigm, in contrast to other approaches, provides a sound basis for reasoning about system dynamics and system comparison.