To ensure that every child receives appropriate educational and developmental supports, professionals who make referrals and rely on psychological test results need to understand what these tests really measure. This highly acclaimed resource explains in layman's terms the principles behind psychological testing, the definitions of key terminology, and how psychologists interpret test data. Practitioners and students will learn about the validity and reliability of numerous widely used measures of intelligence, special abilities, behavioral and emotional status, and academic achievement. Special attention is given to instruments used for developing IEPs and for identifying children for services under IDEA. From making referrals and forming inquiries to identifying early developmental delays or addressing adolescent depression, this book teaches educators, administrators, counselors, and related services providers to confidently and effectively work with psychologists who administer and interpret the results,of children's tests.