This document discusses key concepts related to assessment including testing, measurement, and evaluation. It defines assessment as a systematic process of obtaining information about student learning through various techniques, measuring achievement against learning goals, and making judgements about progress. Testing involves administering an instrument to sample student performance, measurement yields scores that indicate performance levels, and evaluation makes value judgements about performance based on measurements. The characteristics of reliable, suitable, objective and valid assessment are also outlined to ensure decisions are based on sound criteria. The purposes and types of assessment are explained to guide educational decision making.