Critical realism principles include philosophical under-labouring, seriousness, immanent critique, philosophy as presupposition, and enhanced reflexivity. Critical realism assumes an ontologically structured and changing reality. It posits three domains: the empirical (experiences), actual (events), and real (underlying mechanisms). Critical realism combines ontological realism about an independent world, epistemological relativity of knowledge, and judgemental rationality in evaluating theories about the world.