What is the correct meaning of reliability of recruitment and selection tests?

The reliability and validity of recruitment actually refers to the reliability and validity of recruitment assessment; give me an example! If you want to test the weight of a 100KG object, it cannot be measured with a ruler. This is called lack of reliability, and the measurement results are unreliable. If you use a weighing scale with a limit of 10KG, it cannot be measured. This is called lack of validity, and it cannot be measured. To measure the weight of this object, you must use a scale greater than 100KG to ensure accurate measurement results.

Reliability (test reliability) is also called the reliability of the test, which refers to whether the test results are stable and reliable. In other words, does the test score reflect the subject's actual language level?

For example, if the same set of tests is conducted on the same test subject (that is, the subject itself does not change) several times, and the subject's score fluctuates, it means that the test lacks reliability.

Reliability, simply put, means whether it is stable or not. Will the results obtained by using the same questions on different candidates vary greatly? Therefore, it is said to be uninterrupted by systematic errors.