In the past few years, there has been increasing speculation that the next UK general election will produce a Parliament in which no single party holds a majority of seats in the House of Commons. In common parlance, this is referred to as a ‘hung parliament’, although some prefer the expressions ‘balanced parliament’, ‘minority parliament’ or ‘No Overall Control’ (NOC).2 In the UK, it is relatively rare for the Westminster Parliament to be ‘hung’ following an election; however, the probability is increasing due to the growth of third parties and the way that the electoral system translates popular votes into Commons seats. At regular intervals throughout the past two years, opinion polls have regularly predicted that the next general election is likely to produce a hung parliament. Although they are common in other democracies, hung parliaments have traditionally been viewed in the UK as unwelcome aberrations that produce short-lived and ineffectual governments. In light of the increasing likelihood of a hung parliament, the Hansard Society believes the time is right to explore what impact it might have on British politics. As a non-partisan organisation, we are neither ‘for’ nor ‘against’ a hung parliament. We recognise that all parties seek to win any election they contest outright. However, as part of our promotion of effective parliamentary democracy, we believe it would be prudent to shed light on the issues that might arise in the event of a hung parliament. Our new book, No Overall Control?, contains chapters by distinguished academics, politicians and commentators on the key issues surrounding a House of Commons with no overall majority.3 It examines the history of hung parliaments in the UK, constitutional and procedural issues, lessons from other Westminster-style systems where majority governments are less common, and how a hung parliament affects the functioning of Parliament, the prospects for electoral reform and public opinion. This article provides an overview of some of the book's key findings.