This report reviews the process by which candidate states are selected, including a sketch of the responsibilities of Congress and allied governments in final approval or disapproval of Albania and Croatia. The report reviews general political factors for qualification, as well as external issues such as the views of Russia and regional geopolitical considerations. Then follows an analysis of current conditions in the two states nominated to join, as well as in Macedonia. In addition, there is a brief analysis of the debate over the qualifications of Georgia and Ukraine for NATO's Membership Action Plan (MAP), a set of guidelines laid out by the alliance for governments that wish to take the next step of becoming actual candidates. An appendix examines key legislation on enlargement during the past fifteen years. (p. CRS-2).