The Industrial Computer Aided Control toolbox for MATLAB SIMULINK is especially aimed at industrial users like process engineers or commissioners who are not necessarily specialist in control system design. In this paper the integration of industrial control system design functionality into a blockoriented simulation environment by means of the ICAC toolbox is described. For SIMULINK, i.e. MATLABs simulation environment, ICAC CD blocks have been programmed, which can be handled intuitively like other SIMULINK function blocks supporting a guided tour to control system design based on the simplified use of advanced control design methods and an ergonomically designed graphical user interface. The ICAC toolbox composes the control system from industrially available function blocks such as PID controllers and typical nonlinear control schemes.