Funny always hear "the reliability of the test is ...";" this test has a reliability ... " and similar phrases. The problem is that it comes to reliability as a characteristic of the instrument itself, as an intrinsic quality, and perhaps ultimately the same.
Nothing could be further from the truth. When we speak of reliability, this refers to a property of scores observed. It is a relationship between true variance and variance of observed scores, which is affected by many factors external to the test itself. They can therefore have many uses coefficients of reliability as we give the scores derived from a measurement tool.
Let us refer to the issue properly, "the reliability of scores is ..."
Best regards Andrés
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