This report presents results of a project to assess the adequacy of existing data sources on the supply of 21 allied health occupations in order to develop improved data collection strategies and improved procedures for estimation of manpower needs. Following an introduction, chapter 2 provides a discussion of the general phases of the project and makes general recommendations for procedures to improve supply estimates and to improve estimations of requirements for allied health personnel. Chapters 3 to 11 contain individual reports and recommendations for each of the 21 occupations within the nine occupational clusters in this study. For each occupation, the discussion includes an overview of the occupation, definition of the population within the occupation, a description and assessment of data sources, and recommendations for estimating the supply within each occupation, current requirements, and future requirements. Each chapter also contains a summary of findings of the interviews conducted with individuals knowledgeable of the cluster and personnel-to-population ratios for each occupation for which data were available. (YLB)