In Assessing Student Performance, Grant P. Wiggins explores questions about the differences between testing and assessment, about the efficacy of performance tests, how might we analyze our tests, and why increased national testing is not conducive to school accountability. He strives to clarify the limits of testing in an assessment system as he analyzes problematic practices in test design and formats that prevent students from explaining their answers. By showing us that assessment is more than testing and intellectual performance is more than right answers, Wiggins leads us to new systems of assessment that more closely examine students’ habits of mind and provide teachers and policy makers with more useful and credible feedback.