Although metacognition can simply be interpreted as thinking about one’s own thinking, it is actually a complex construct that plays a central role in theories of conceptual change. In a 1988 review, R.T. White identified 4 facets of metacognition: (1) propositional knowledge about cognition ( knowledge of the factors that affect ability to memorize something), (2) awareness of one’s own thoughts (monitoring one’s own understanding during a lecture), (3) ability to regulate thinking (deciding what path to take while attempting to solve a difficult problem), and (4) readiness to apply the ability to regulate thinking. Metacognition is important for developing and understanding of ideas; and awareness and control of thinking have been shown to have a significant impact on problem-solving success.