Make different sets of question that can measure the same factor. The next way in estimating reliability is internal consistency. Then, if the results of the two tests are the same, it means that certain measurement is reliable. It must be measured twice in different times, then compare the similarities of the results of the two tests. You simply test an idea twice, test 1 and test 2. The first way is the test or retest and the other is the internal consistency. There are two ways in estimating whether a certain thing is reliable or not. It means if you are using a certain kind of instrument for a test and the results on the subjects you are testing is the same for the first and second try, then it is considered reliable. Reliability is when your measurement is consistent. So to avoid confusion, here are the differences of the two. These terms are often used on scholastic outputs such as thesis studies, term papers, research papers, and the likes. They are actually different things, different terms when they are explained in a technical manner. Reliability and validity seem to be synonymous, but they do not mean the same thing.
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