We decided to use IVE tool because there was no suitable tool for usability analysis that could be used in our use case, which is mobile indoor navigation application. Mobile navigation applications must be tested in the real environment in order to find out usability problems that appear when user is navigating through this environment. Usability study in the lab cannot discover these usability problems (e.g. because of missing context) but the execution and analysis of data from usability lab is much easier. Below there are mentioned several motivations and requirements that were derived from the use case.