 Davidson presents this assumption as obvious and not in need of justification, but we shall see that motivations for it can be found in parts of his writings  (2.2).  To this interaction principle is added the requirement that all singular causal interactions are covered by strict laws—laws with fully articulated antecedents which guarantee some fully articulated consequence (for caveats and details,  see 3.1).  Davidson calls this the Principle of the Nomological Character of Causality; we shall call it the cause-law principle: