Sumário:Sharia Guarantee Clauses and the challenge of enforcing then : The classical Sunni principle that state legislation must respect sharia. Modern reformulations of siyasa shar'iyya and the temporary disappearance of SGCs. The Islamic revival and the reappearance of SGCs in an age of contest about Islam -- SGC enforcement schemes in the twentieth and twenty-first centuries : A basic typology of SGC enforcement schemes. "Primarily political" systems for SGC enforcement. Primarily "legal" mechanisms for enforcing constitutional Islamization. Hybrid or "dialogic" mechanisms for enforcing SGCs -- Designing SGC enforcement mechanisms for democratizing and liberalizing the Muslim world : The recent trend towards democratization in the Muslim world. Western debates about the institutions best suited to interpret and enforce contested rights principles. Lessons from Muslim experiences with SGC enforcement. Designing successful SGC enforcement schemes for Islamic democracies: initial hypotheses.