In the paper the toolbox for dynamical system analysis is presented and illustrated for the model of real multivariable plant. Its possibilities can be observed in several different ways. The functions realised in Matlab program package can treat similarly SISO and MIMO systems in several different design phases, so they are organised in four groups: in open and closed-loop analysis and in absolute and relative validation. The access to all options is enabled also through windows oriented graphical environment. Good experiences with toolbox usage confirmed correct orientation of the discussed software.