Measurement involves quantifying observations about attributes to make determinations less ambiguous. Evaluation is a process of considering evidence in light of standards and goals. There are various types of evaluation including placement, formative, diagnostic, and summative. Placement evaluation determines students' existing knowledge and skills. Formative evaluation identifies errors and provides feedback during instruction. Diagnostic evaluation detects learning difficulties, while summative evaluation assesses achievement at the end of a period. Evaluation should be based on clear objectives, use appropriate procedures, be comprehensive, continuous, diagnostic, cooperative, and used judiciously to improve the learning process.