The concept refers to the value of quality and can be applied to any aspect of the research process. For the measurement process, whether it involves research tools measure which it created to measure.
The possibility of a reliable tool to mention the ability to generate consistent measurements in the same or similar conditions for the same population and obtained the same results, we say that this tool "credible".
There consistent processes outside and inside to determine the ability to believe tree. Retry and parallel methods of the same test as the two processes identified external reliability. Half cutting techniques are classified on a consistent internal processes.
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