Öz This essay first aims to ground, in the implementation of ‘first philosophy’ to social sciences, thecomplementary approaches of Karl Popper’s ‘evolutionary epistemology’ and Roy Bhaskar - TonyLawson’s ‘critical realism’; and, thereby, to forge a link between the philosophies of economicthinkers. Secondly it aims to rediscover the concept of uncertainty and mostly a constructionwithin the framework of the relationship between the ‘first philosophy’ and modes of philosophicalthinking which were influenced by it.