This report outlines statewide results on the Texas Assessment of Academic Skills (TAAS) for the 1998-1999 academic year. Also included are statewide data from the administration of the Spanish TAAS and the Algebra I, Biology, English II, and U.S. History end-of-course examinations. To allow a broader view of the assessment program's history, 6-year comparisons of the percentage passing rates and the Texas Learning Index data are included. The chapters are: (1) "Executive Summary"; (2) "Assessment Program Overview"; (3) "TAAS Results by Grade Level: Spring 1999"; (4) "End-of-Course Examinations: Spring 1999"; (5) "TAAS and End-of-Course Regional Results"; (6) "A Study of the Correlation of Course Performance and End-of-Course Test Performance on the Algebra I End-of-Course Test"; and (7) "National Comparative Data Study." Sixteen appendixes contain supplemental information and summary reports. (Contains 41 tables.) (SLD)