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This book proposes a framework for assessing countries' levels of compliance with international space law and norms. It begins by exploring the development of two movements - the evidence-based policymaking and programming movement, and the rise of ratings and rankings research - and their growth across various disciplines. The analysis suggests that such efforts are useful in gauging the behavior of countries in space according to how well they adhere to existing space law and norms. To date, there is no comprehensive, periodic, and systematic measure of countries' efforts to comply with space law and norms; this work endeavors to fill that gap by offering a framework in which to assess compliance. Applying the framework results in five possible ratings that a country may be assigned, ranging from highly compliant to non-compliant. Ideally, the proposed framework can be used to promote compliance, and with it, space security and sustainability.