It gives an overview of System Identification theory, the basic models and disturbance descriptions used, and the character of the basic algorithms. It also provides some practical advice for a number of issues that are essential for a successful application.
It describes the commands and objects of the System Identification Toolbox, their syntax and use. If you primarily use the graphical user interface (GUI), you will not have to bother about these aspects.
It also describes the commands that are not reached from the GUI; i.e., simulation, the recursive algorithms and more advanced model structure definitions.