This chapter illustrates an asymmetric comparative international law approach to treaty interpretation through the example of the CEDAW Committee’s greater willingness to go beyond a margin of appreciation to tolerate progressive deviations rather than regressive deviations in the interpretation of CEDAW’s provisions. Section I examines the interactions between the CEDAW Committee and states parties. Section II discusses how the Committee’s asymmetric approach to treaty interpretation fits within a comparative international law project. Section III provides an introduction to the CEDAW Committee. Section IV illustrates the CEDAW Committee’s inflexible treatment of Muslim states parties’ reservations to the Convention, which constitute regressive deviations. Section V analyzes the Committee’s permissive treatment of the Scandinavian approach to CEDAW. Section VI explores how the asymmetric approach allows states to develop interpretations of treaties. Section VII concludes and describes potential future avenues of research into the asymmetric comparative international law approach to treaty interpretation.