While developing a Launch System, keeping track of technical requirements, interfaces information and their respect throughout the different studies and analyses is mandatory. This allows to make sure having a consistent System from the specification phase to the qualification phase. For its development, Latitude enters an important phase of tests which results will play an important role in the remaining path to the flight. In this context, system engineering is important to keep track of technical coherence but also tests success, failures, changes of configuration, etc in order to have successful qualification and flight approval.