over replication is comparable in many respects to controversy among policy analysts about the ends and means of regulation. Proponents of replication seek to provide the collective good of free-flowing information and to sanction the negative externality of sloppy scholarship. Similarly, opponents of replication claim property rights in the data and variables they have created through hard work and ingenuity. As with disputes over regulatory policy, the fundamental sticking point is whether the benefits of mandatory replication to the community of political scientists outweigh the costs of compliance to individuals.