The rise of the xenophobic and paranoid Khmer Rouge government in Cambodia made Cambodia's continued participation unsustainable, so in April 1977 the other three riparians agreed to the "Declaration Concerning the Interim Mekong Committee", which resulted in the establishment of the Interim Mekong Committee in January 1978. The weakened interim organization was only able to study large-scale projects and implement a few small-scale projects, almost exclusively in Thailand; instead the institutional role of the organization shifted largely to data collection. The 1987 "Revised Indicative Basin Plan"—the high-water mark of the Interim Committee's activity—scaled back the ambitions of the 1970 plan, envisioning a cascade of smaller dams along the Mekong's mainstream, divided into 29 projects, 26 of which were strictly national in scope. The Revised Indicative Basin Plan can also be seen as laying the groundwork for Cambodia's readmission. The Supreme National Council of Cambodia did request readmission in June 1991.