trophic levels.- Optimisation et Planification des Reseaux de Telecommunications.- World models a case study on social responsability and impact.- A mathematical model for pressure swing adsorption.- A four-variable world system.- The application of gradient algorithms to the optimization of controlled versions of the world 2 model of forrester.- A new approach to modelling in planning of electric power systems.- On the optimization of peat burning plants.- A multi-area approach to the economic optimization of electric power system.- Le Probleme de la Multivalence dans le Travail Continu.- Search and montecarlo techniques for determining reservoir operating policies.- A model of many goal-oriented stochastic automata with application on a marketing problem.- The forecast and planning of manpower with implications to higher educational institutions-mathematical models.- Etablissement Automatique des Tableaux de Marche et Feuilles de Service dans un Reseau de Transport.- Construction Automatique des Horaires d'Une Ligne d'Autobus.- Regional school districting via mathematical programming.- On the optimal control of natural resource use in the neoclassical economic framework.- Computer elaboration of time-table for single railway line.- An interactive implementation of control theory techniques applied to Pindyck's model of the U.S. Economy.- Control in economy based on non-price information.- Modelling and optimization techniques in accordance with the information requirements for socio-economic development.- Population planning; a distributed time optimal control problem.- On the optimality of a switch- over policy for controlling the queue size in an M/G/1 queue with variable service rate.- Optimization of resource allocation in R+D projects.- Optimal ocean navigation.- Design and application of an interactive simulation language.- A functional package for monitoring branching methods in combinatorial optimization.- Scorpion : Systeme de Modelisation et d'Optimisation.- An interactive system for modeling.- A network combining packet switching and time division circuit switching in a common system.- Optimum allocation of investments in a two ¿ Region economy.