A design environment specially tailored to problems in control engineering is presented. It contains, apart from plant models and operating environments, the formulation of the experimental environment. Linear controllers of any desired structure are designed with the aid of the characteristic variables of the experiments, using a vector optimization procedure in an interactive design process. The hierarchical description of the model, based on an interpreter solution, was realized in the ADA programming language. A complex problem in controller design, taken from the field of vehicle suspension, proves the efficiency and performance of the design tool.