Are the effects of candidate selection through party primaries largely disruptive for political parties or do they have some redeeming features? Icelandic parties have used inclusive nomination procedures since the early 1970s on a scale that is without parallel in other parliamentary democracies. The Icelandic primaries thus offer a unique opportunity to study the effects of primaries in a context that is quite distinct from the most studied primary election system, i.e. the United States, which is characterized by federalism, presidential government and two-party competition. Our findings indicate that, despite four decades of primaries, the Icelandic parties remain strong and cohesive organizations, suffering almost none of the ailments predicted by critics of primary elections. We are careful to point out, however, that context matters and the way parties have adapted also plays a role.