Educational assessment is a process used to document students' knowledge, skills, attitudes, and beliefs through measurable terms. The overall goal of assessment is to improve student learning and provide information on student progress and achievement of learning outcomes. There are different types of assessment, including formative assessment used during instruction to monitor learning, summative assessment used at the end to evaluate learning and assign grades, and diagnostic assessment used at the beginning to identify student strengths and weaknesses. Effective assessment considers principles like validity, reliability, and fulfilling the intended purpose of the assessment.