Evolutions in corporate law recently introduced an optional commitment mechanism in the corporate contract: a purpose. Its writing is a pivotal but is yet puzzling from a design perspective. Especially it raises questions about how that could help shaping a responsible governance model for innovation. Our paper builds on an extended-decision framework to propose a formal model of how a stated-purpose shapes the decision situation. Our results highlight several purpose formulation strategies and finally a typology regarding how robustness to changes is embedded in the process is proposed.