The development of a system begins with the com-prehension of its mission and the gathering of the expectations and needs of all involved parties. Transforming these into a set of complete and coherent requirements is essential for the mission’s success. That is even more true in the space systems’ context due to the high costs associated with tardiness in finding and correcting mistakes. The Brazilian Strategic Program of Space Systems (PESE) presents the guidelines for the long-term implementation of space systems projects. It demands that the definition and development of space system missions must follow Brazilian Air Force’s DCA 400-6 guideline and, when appropriate, other international standards. This article presents a brief survey and analysis of some available system and requirement engineering processes that could be used as guidelines to the conceptualization of a system, such: DCA 400-6, Brazilian Defense Ministry Manual MD40-M-01, INCOSE SE Handbook, ISO/IEC/IEEE 15288:2015, and NASA SE Handbook.