Trust, but verify: control mechanisms in multiparty governments

This chapter explains why coalition governance creates a distinctive “control” problem and reviews the institutional tools parties use to manage it. Coalition cabinets are common in parliamentary democracies, yet much classic research focused on how coalitions form and end; the chapter instead centers on what happens in between—how partners enforce policy compromises while still competing against one another electorally. The core argument is that coalition politics is a mixed-motive game: parties must cooperate to govern, but also have incentives to differentiate themselves for voters. Delegation to portfolio-holding ministers magnifies this tension because ministers and their bureaucracies enjoy informational and procedural advantages in drafting and implementing policy. This combination creates the risk of “ministerial drift,” where policy in a minister’s jurisdiction moves toward the ministerial party’s preferences rather than the coalition compromise. The chapter distinguishes two broad ways coalitions can mitigate drift. One is to raise the political costs of reneging, for example by publicizing intended compromises. But written agreements often provide limited enforcement on contentious issues and tend to emphasize dispute-resolution procedures rather than guaranteeing compliance. The second approach is to build mechanisms that allow partners to detect and correct drift by developing expertise and creating opportunities to amend proposals. It then surveys key institutions. Inside the executive, cabinet/coalition committees can help but are hard to use systematically given the sheer scope of policymaking. More targeted tools include “watchdog” junior ministers who shadow partners’ ministers—especially in divisive jurisdictions—and the deliberate creation of overlapping ministerial responsibilities so that multiple parties shape drafts in sensitive policy areas. A central emphasis is on legislative institutions—especially committee systems—that enable information-gathering (expertise, documents, testimony) and amendment (redrafting or credible amendment rights), particularly when agenda-setting rules do not choke off debate and changes. Evidence reviewed in the chapter shows that strong “policing” institutions increase scrutiny and amendment on internally divisive bills and can shift policy outcomes from minister-dominated to coalition-wide responsiveness; it also notes that oversight institutions may strengthen where coalition governance is frequent and ideologically diverse.