Recent research has shown that organizational routines are not as rigid as previously assumed but are subject to significant endogenous change in the very process of their performance. We contribute to the discussion on organizational routines by describing the conventionalist perspective and elaborating how this perspective can provide more nuanced insights into why the performance of organizational routines changes or remains stable. Drawing on the theory of Economy of Conven-tions, we argue that focusing on the actor’s requirement for justification can provide new insights into the reasons for stability and change in routines.