Reliability and validity are two important indicators to measure the quality of test questions.

Reliability refers to the stability or consistency of measurement results, that is, whether the measurement results are reliable and repeatable. A high-quality measurement topic should have high reliability, that is, no matter when and how it is measured, the results should be similar or consistent. The evaluation of reliability can be carried out by calculating the variance of measurement results, retest reliability and internal consistency reliability.

Validity refers to the authenticity or accuracy of the measurement results, that is, whether the measurement results truly reflect the contents or attributes to be measured. A high-quality measurement topic should have high validity, that is, the measurement results should truly reflect the actual situation or ability of the subject. Validity can be evaluated by content validity, structure validity and criterion-related validity.

Reliability and validity are the two most important indexes to evaluate the quality of measurement questions. If the reliability and validity of a measurement topic are high, then this measurement topic can be considered as a high-quality measurement topic. On the contrary, if the reliability and validity are low, then this measurement problem needs to be improved or eliminated.

In a word, it is very important to evaluate the quality of measurement questions in many fields such as psychology, pedagogy and sociology. Only by evaluating the reliability and validity of the measurement questions can the quality of the measurement questions reach a certain standard, thus providing reliable data support for subsequent research or practice.