Reform as a social process is underresearched in the case of Tibet. This study addresses this gap using Social Movement Theory, which sees social change as a complex process involving various Tibetan social groups and external reformers, the Communist Party of China (CPC). This approach was applied by comparing recruitment and mobilization efforts of several key internal and external reform movements in 20th century Tibetan history. Findings include that internal reform failures can be explained by their narrow social and geographic basis and limited mass appeal. Moreover, initial CPC reforms succeeded through recruitment and mobilization across Tibetan regions and social groupings. Subsequent reforms failed due to decreased attention to re...