This chapter describes two constructivist frameworks: a procedural and a constitutive framework. Procedural accounts are output models that vindicate political principles as the outcome of a deliberation procedure. Constitutive accounts identify the constitutive relationship between principles and practical deliberations aimed at some object as constructivism’s key feature. The chapter argues that both procedural and constitutive frameworks satisfactorily address the arbitrary charge associated with the first horn of the Euthyphro dilemma.