A vity analysis of a brand perception and marketing investment adjustment model is presented. This model was developed in the Simulation Laboratory at the Rosario University. This work consists of an introduction to the topic of vity analysis and the complementary uncertainty analysis. It carries on to show the development of analyzes using a simple example of application of the model through comprehensive and rigorous implementation of the steps presented in the previous section. A discussion on the issue of measuring magnitudes, which was the most complex factor in the application of the model in the practical context. Finally, conclusions on the results of the analysis are given.