Abstract
Any measurement system must be in statistical control and the confirmation of measurability is the basic theo- retical hypothesis in educational and psychological measurement. We analyze some assumptions in three measurement models in psychological and educational system through the history analysis and comparative study. Based on this, we propose three postulations in educational and psychological measurement: psychological and educational measurement object is an objective existence in quality; the quantity relative stability of the measuring object is unity of quantity relative invariance in individual objects and quantity difference in group objects; hypothesis of measurability of quan- tity: Psychological and educational measurement object can be measured in the quantity. The study improves the theo- retical postulations and provides a solid foundation for educational and psychological system measurement.
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