Doctrinal legal research analyzes statutes, cases, and legal principles to understand prevailing legal doctrines. It aims to develop consistent theories of law. Non-doctrinal research examines law's relationship with social values and institutions through empirical data. It seeks to understand if legal theories are appropriate and valid in society. While doctrinal research emphasizes substantive law, non-doctrinal research assesses law's social impact. The two approaches complement one another, with doctrinal research clarifying law and non-doctrinal research providing social context.