Assessment of student learning, the measuring of students' progress and performance, is an important concern for library media specialists. Twelve articles are presented which address the issue of assessment of library media services. The titles are: "The Growth of Assessment" (George F. Madaus, Ann G. A. Tan); "Library Information Skills and Standardized Achievement Tests" (Mary M. Jackson); "From Indicators of Quantity to Measures of Effectiveness: Ensuring 'Information Power's' Mission" (Robert E. Berkowitz); "Expanding the Evaluation Role in the Critical-Thinking Curriculum" (Daniel Callison); "Assessing the Library Research Process" (Carol Collier Kuhlthau); "Alternative Assessment: Promises and Pitfalls" (Delia Neuman); "Assessment of Student Performance: The Fourth Step in the Instructional Design Process" (Barbara K. Stripling); "What's the Difference between 'Authentic' and 'Performance' Assessment?" (Carol A. Meyer); "Practicing Authentic Assessment in the School Library" (Barbara K. Stripling); "The Potential for Portfolio Assessment" (Daniel Callison); "Assessing the Big Outcomes" (Nora Redding); and "Linking Assessment to Accountability: Sixth-Grade Performance Assessment" (Willa Spicer, Joyce Sherman). A subject index concludes the book. (MAS)