ICALP RANDOM 2000: Samson Abramsky: Game Semantics: Achievements and Prospects. Gregor Engels: Graph Transformation as Unifying Formal Framework for System Modeling and Model Evolution. Johan Hastad: Which NP-hard optimization problems admit non-trivial efficient approximation algorithms? Roberto Gorrieri: Non Interference for Analysis of Cryptographic Protocols. Zohar Manna: Alterating Verification Diagrams. Kurt Mehlhorn: Graph Algorithms and Constraint Programming. Oded Goldreich: Pseudorandomness. Andrei Broder: Min-wise Independent Permutations: Theory and Practice.