ICONGRAPH is an interactive program package for CAD of control systems. The system under investigation has to be basically a linear single-loop one with lumped parameters. ICONGRAPH covers the following subjects: identification, design of controllers in the frequency and operator domains by minimizing integral criteria, discrete controller design, block-oriented simulation, state-space techniques and transformations among various system descriptions. The program package is written in FORTRAN and is run on the minicomputer R10 of 64 kbyte operative memory. All the results are plotted on a digital plotter.