The following studies were undertaken by the Center for Migration and Development or its members during the last ten years; or by its director, Alejandro Portes, in prior years. Click on the name of the study to access a detailed study description and all associated data files, codebooks, questionnaires, and publication lists. Data sets are available as ascii data files, Stata, and/or SPSS system files. The codebooks, which present values, value labels, and frequencies, are available in the following formats: .pdf (accessible with Adobe Reader), .rtf, or .cdx (both accessible with Microsoft Word). The Comparative Immigrant Organization Project (CIOP) The Comparative Immigrant Entrepreneurship Project (CIEP) The Children of Immigrants Longitudinal Study (CILS) Cuban and Mexican Immigrants in the U.S. Caribbean Urbanization in the Years of the Crisis The Adaptation Process of Cuban and Haitian Refugees Mexican Migration Project (MMP) Latin American Migration Project (LAMP) New Immigrant Survey (NIS)   These materials may be copied freely for scholarly research and educational purposes.