Nlmimo, non-linear multi-input multi-output toolbox. NLMIMO, Non-Linear Multi Input Multi Output, is a MATLAB toolbox for modeling nonlinear dynamic systems. The toolbox has been developed using an object oriented approach. Model representations for linear, Takagi-Sugeno, Mamdani, and lazy mappings, as well as various model identification techniques, have been integrated. They are available as a set of interchangeable classes which can be easily extended. The toolbox is completed by a series of tools for the visualization of the models, and a database management utility for listing the properties of the mappings associated to the system, comparing their performance and validating them.