1. Repeatability of research results.

2. Measurement accuracy.

3. Stability of the results obtained using a particular technique in time and with respect to different interferences (covariates).

In a narrow empirical sense. Reliability is understood as the consistency of people’s test results at different points in time. during primary and secondary testing and using tasks that differ in terms of equivalence and content. Reliability characterizes tests of properties. but not cases.