This document presents the results of a Texas survey undertaken to ascertain which developmental diagnostic and screening tests are used in the state to identify Mexican-American preschool children with learning disabilities. A total of 91 public schools, regional service centers, and Head Start centers throughout the state responded to the survey. Respondents were asked to indicate the extent to which they used each developmental test. They also delineated their population as: (1) Black, (2) Anglo, (3) Mexican-American (tests administered in English), or (4) Mexican-American (tests administered in Spanish). Results showed that the Peabody Picture Vocabulary Test, followed by the Stanford-Binet and IPAT Culture-Fair Intelligence Test, were used by the largest number of sites. Of the tests administered to Mexican-Americans, almost twice as many were given in English as in Spanish. Few schools reported using observation techniques for diagnostic purposes. A number of sites indicated that they adapted or developed tests for individual diagnostic assessment of learning problems. Brief descriptions of 20 tests are provided in a Test Reference List. (BRT)