Coalition governments are the norm in most of the world's parliamentary democracies. Because these governments are comprised of multiple political parties, they are subject to tensions that are largely absent under single-party government. The pressures of electoral competition and the necessity of delegating substantial authority to ministers affiliated with specific parties threaten the compromise agreements that are at the heart of coalition governance. The central argument of Parliaments and Coalitions is that strong legislative institutions play a critical role in allowing parties to...