**6. Interpretation of Cronbach's alpha**

The interpretation of reliability is the correlation of the test with itself. When the estimate of reliability increases, the portion of a test score related to the error will decrease. Wise interpretation of alpha needs an understanding of the interrelatedness of items and whether the items measure a single latent trait or construct. Exam or test with different content materials such as integrated courses, for example, in the musculoskeletal system course, although is dominated by anatomy it contains other subjects of basic medical and clinical sciences that have different contains. Therefore, interpretation of such a course exam needs deep looks beyond the alpha figure. It was reported that KR20 of 0.7 is acceptable to short test (less than 50 items) and KR20 of 0.8 for an extended test (more than 50 item-test) [25]. Moreover, it was documented that a multidimensional exam does not have a lower (**Table 1**) alpha value than a unidimensional one [30].

A low alpha value can be due to a smaller number of items, reduced interrelatedness between items, or heterogeneous constructs [22]. A high value of alpha can suggest exam reliability, and some items are non-functional as they are testing the same content but in a different guise or repeated ones [16, 22]. Also, a high value indicates items with high interrelatedness, indicating a limited coverage of the content materials [22].
