BRICS NS-99-3 Mosses & Watt (eds.): AS ’99 Proceedings BRICS Basic Research in Computer Science Proceedings of the Second International Workshop on Action Semantics AS ’99 Amsterdam, The Netherlands, March 21, 1999 Peter D. Mosses David A. Watt (editors) BRICS Notes Series NS-99-3 ISSN 0909-3206 May 1999