Tests are widely used in educational institutions, industries, and clinics to evaluate individuals. In schools, tests help determine student growth, classify students by ability, identify those needing special assistance, and diagnose academic issues. Counselors use tests to disclose capacities and potentials, objectively assess personalities, and accurately compare individuals. Major errors in psychological testing include incorrect administration, overgeneralization, and using inappropriate tests. Tests are classified based on purpose and intended population, and acquired from testing organizations depending on the qualifications of the administrator. Other evaluation methods discussed include anecdotal records, autobiographies, behavior rating scales, sociograms, interviews, cumulative records, case studies, and the increasing use of computers.