In this paper a system identification toolbox for MATLAB is introduced, including a user friendly
graphical user interface. The toolbox is appropriate for the identification of systems in discrete-time
linear parameter varying (LPV) form. Using LPVIOID1 it is possible to identify input-output
models in open-loop and closed-loop settings based on experimental data. It comprises several
recent LPV identification techniques. Furthermore, a novel method for identifying unstable plants in
closed-loop is proposed. The toolbox is equipped with several tools for model validation. Examples
for illustration are included.