In Research, we used to study different aspects so we need consistency, accuracy and precision results in the study, it is called Reliability, When we did measure or test repeatedly for measurement and it gives the same results, then it is called reliable.
Reliability has two principal forms:
1.Temporal Reliability: It shows the same results when the measurement is repeated at a later time.
2.Comparative Reliability: If two Different Researchers use the same test on different samples if they get the same results we called it as Comparative Reliability.
Poor reliability or problem of reliability happens when we get the same results with the same test or measurement at different time
Look at Collective behaviour