"One problem that did not face the analyst until the 1960s was the constitution of the international Communist movement. The parties that belonged to the Comintern were the orthodox parties, and even after its dissolution there was no problem in identifying members of the 'Stalinist international.' Within the last decade, however, the scene has been confused by the appearance of Marxist- oriented-guerrilla and 'New Leftist' movements which also might be designated 'Communist.' The editors of the yearbook have coped with this development by treating as Communist parties only those that describe themselves as Marxist- Leninist and are so recognized by authoritative Communist publications, such as the World Marxist Review. This is not a bad solution for identification of 'orthodox.' Communist parties. What the editors do not face up to, however, is the concept of the 'international Communist movement.'"