In this paper, an Integrated Computer Aided System (ICAS), which is particularly suitable for solving problems related to integrated design and control of chemical processes, is presented. ICAS features include a modelling feature (generation of problem specific models, such as linear model, reduced model, simple and/or complex non-linear model), a simulation feature (steady state and dynamic simulation, open-loop and closed-loop simulation), an analysis feature (operability, sensitivity and controllability) and design features (design of operations and controllers). Two application examples involving non-ideal mixtures and highlighting some of the new features of ICAS are presented.