This book chapter elucidates why metacognition is a seminal pedagogical principle of legal research instruction and information literacy. This begins with a holistic definition of metacognition as the ability to assess, not only the result of a research activity, but the schemata, including the processes leading to the result; and then relating this to other concepts and principles applicable to legal education. It then explains why students’ development of metacognitive abilities is an imperative to legal information literacy and other signature pedagogies currently under development. The relationship of metacognition to the pedagogical underpinnings and objectives of the Carnegie Report is highlighted. The chapter concludes with sample lesson plans and activities by which instructors and librarians can foster the acquisition of metacognition skills.