SYSDEF (DECISION AIDING AND TRAINING SYSTEMS) aims at dealing in full with real scale problems of optimisation, decision aiding and training, from theoretical research (formal models and axiomatic analyses, algorithms and complexity) to industrial applications. Its domain of research comes under both Artificial Intelligence (AI) and Operations Research (OR) and is organised around three complementary fields: - decision theory (multicriteria decision making, decision under uncertainty) and decision-support systems; - combinatorial optimisation (scheduling, complexity); - systems for assistance to training.