This application for a methodological R21 builds upon the interest of examining potential approaches to using existing public use secondary data for the study of the Asian Pacific Islander racial category previously defined by the U.S. Census. With the exception of census data, and the most recent waves of the national health interview survey there are no nationally representative surveys that over sample for API populations. This application will examine these issues explicitly, measure potential biases and suggest potential alternatives for defining useful samples of APIs using existing secondary data This application has four primary goals: 1? To evaluate the efficacy of the statistical representation of Asian and Pacific Islander (API) population in U.S. based samples and surveys. This will be accomplished by cataloging and identifying sample sizes of major US surveys that report API populations and how these samples have been used in peer reviewed publications; 2?To identify funded research studies which have examined API populations that are not currently in the public domain and seek to acquire these studies or, at a minimum, to document these studies and their sample designs; 3?To distribute these new materials and data collections through the Inter-university Consortium for Political and Social Research (ICPSR) Minority Data Research Center a centralized repository for data on minority populations in the public domain.