This manual presents the major lessons learned about how national authorities, individual institutions, and individual educators can work to increase the impact of the Associated Schools Project (ASP) schools and spread it to other parts of the educational system. ASP is a project of the United Nations Educational, Scientific and Cultural Organization (UNESCO) begun in 1953 in order to promote education for international understanding through the conduct of experimental teaching activities. In particular, the growth of the ASP is presented as an example of a world-wide "multiplier effect," i.e., quantitative growth in numbers in participating countries, institutions, teachers and students accompanied by an extension of qualitative impact. Part 1 provides an overview of how to set goals for ensuring that results of ASP activities make an impact in national educational systems. This part includes sections on roles for senior authorities and decision makers, international education, current goals in ASP work, and multiplier effects as goal actions. The remainder of the manual deals with proven strategies for increasing the multiplier effect, starting at the school and moving to the regional, national, and international levels. The manual concentrates on measures that will increase the use of results from the ASP schools. (JB)