Assessment refers to procedures used to gather information about student performance and can be formative or summative. Formative assessment is used to improve student learning while it is occurring, while summative assessment evaluates student learning at the end of a period of instruction. There are various methods of assessment, including teacher-made tests and standardized tests, which are used for multiple purposes like improving instruction, providing student guidance, and administrative decision-making. Proper assessment principles include matching assessments to objectives and providing feedback to students.