The report presents findings concerning the language proficiency of elementary, middle, and high school students receiving bilingual services in the Las Cruces Public Schools (New Mexico). The report contains five sections: general information about the bilingual program in the school district; the Idea Language Proficiency Tests (IPT); results of the English and Spanish oral tests; results of the English and Spanish reading and writing tests; and recommendations. Highlights of the findings include the following: an overall decrease in the number of non-English and limited-English speakers and a rise in the number of fluent English speakers; an overall increase in fluent Spanish speakers and decrease in limited-Spanish speakers; differential program effects on LAU ratings of oral proficiency; an overall rise in competent English readers and writers; and an overall rise in competent Spanish readers and writers. In all cases, differential program effects were found, and are summarized, for students at each school level (elementary, middle, high school) and for different bilingual program levels (6-hour, 3-hour, 2-hour, 1-hour). Acronyms used in the analysis and forms used for collecting data are appended. (MSE)