The resolution of civil engineering problems requires the formulation of constitutive models which can predict the geomaterials behaviour. Many constitutive models have been developed, but only few are used to solve practical problems. Indeed, geomaterials constitutive models are complex and often involve a high number of parameters. They are generally proposed with restricted tests which do not permit users to precisely discern their field of application. A large industrial use of a constitutive model requires the preparation of a validation file which contains some indespensable information such as mathematical formulation, parameters identification, experimental data predictions, sensitivity study, qualitative prediction of particular paths and comparison with some known constitutive models. The preparation of this file is complex: it needs homogeneous and non-homogeneous tests, numerical codes, a thorough knowledge in the field of constitutive models, and it is usually time-consuming. In order to facilitate and improve the preparation of such a document, we have developed a computer software named VALOIS which carries out automatically and reliably various validation tests on homogeneous paths. After a description of these tests and of VALOIS organization, we present its application to set up the validation file of CYCLADE, and elastoplastic model with multiple yield surfaces and kinematic hardening.