The objective is to place representatives of the target population in front of the interface and analyze the activity of these users in context. Prior examination of the tool that is being evaluated is essential as it enables us to identify the parameters that make up aim of the test. Through testing, we can verify the usability of the interface for your users in a real-life situation. This service unfolds in several steps, starting with the set up for the test (identification of the target user as well as the user's characteristics and objectives, recruitment of participants, preparation of the test's layout, pre and post questionnaires, etc.) and going through to the practical phases of the test itself (preparation of material, testing, analysis and significance of the results).