Publisher Summary Two generations of vestibulo-ocular reflex (VOR) models can be distinguished. This chapter describes a first generation model of VOR. The first generation models describe the VOR as an isolated system with uncontrollable characteristics. Most of the first generation models of VOR are limited to a description of the smooth compensatory eye movements induced by vestibular stimulations. Only few of them try to interpret the generation of vestibular nystagmus for what concerns both its slow and its fast phases. In the latter, two distinct pathways are generally assumed, one controlling eye movement during the slow phase of nystagmus and the other programming the fast phase saccades. The chapter provides reports of some experimental results proving the plasticity of VOR, and presents a second generation model of VOR that can interpret its plastic behavior. It develops new models to explain as many characteristics of vestibularly induced eye movements as possible. Any new or revised model will give a challenge to the physiologist for programming oriented experiments which, in turns, will provide additional data for further modeling efforts. The models presented in the chapter have to be considered as a contribution to the trial and error process.