Cronbach's Alpha: Review of Limitations and Associated Recommendations

Abstract

This paper discusses the limitations of Cronbach's alpha as a sole index of reliability, showing how Cronbach's alpha is analytically handicapped to capture important measurement errors and scale dimensionality, and how it is not invariant under variations of scale length, interitem correlation, and sample characteristics. In addition, the limitations and strengths of several recommendations on how to ameliorate these problems were critically reviewed. It was shown that the reliance on Cronbach's alpha as a sole index of reliability is no longer sufficiently warranted. This requires that other indices of internal consistency be reported along with alpha coefficient, and that when a scale is composed of large number of items, factor analysis should be performed, and appropriate internal consistency estimation method applied. This approach, if adopted, will largely minimize and guard against uncritical use of Cronbach's alpha coefficient.

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