Stakeholder value analysis of architecture alternatives for sustainable space systems developments

Resumo

The purpose of this paper is to present the stakeholder value architecture trade off method, and to demonstrate it analyzing the Lunar Exploration Mission. Nowadays space mission development requires a high level of sustainability that only can be given by stakeholders who need to be assured that they will receive the required amount of system value over a specific period of time. This sustainability is translated by the system architecture attributes as cost, time, performance and risk which represent system effectiveness. Considering that about 80% of the life cycle cost, performance, risk and schedule of a project are committed by decisions made during design concept exploration; this paper addresses several questions such as: how to improve such architectures evaluations? How to evaluate architectures through how much stakeholder value cost, performance, risk and schedule system attributes? These questions do reflect the state of art of the design trade off process regarding to conceptual phase. The paper proposes a subtle but closer to reality paradigm shift: Trade the importance stakeholders give to performance, cost, risk and schedule attributes rather than those attributes themselves.