![]() As stated by Sijtsma (2009), its popularity is such that Cronbach (1951) has been cited as a reference more frequently than the article on the discovery of the DNA double helix. The α coefficient is the most widely used procedure for estimating reliability in applied research. The results show that omega coefficient is always better choice than alpha and in the presence of skew items is preferable to use omega and glb coefficients even in small samples. In this paper, using Monte Carlo simulation, the performance of these reliability coefficients under a one-dimensional model is evaluated in terms of skewness and no tau-equivalence. This procedure has proved very resistant to the passage of time, even if its limitations are well documented and although there are better options as omega coefficient or the different versions of glb, with obvious advantages especially for applied research in which the ítems differ in quality or have skewed distributions. The Cronbach's alpha is the most widely used method for estimating internal consistency reliability. 3Department of Methodology of the Behavioral Sciences, University Complutense de Madrid, Madrid, Spain.2Department of Social Psychology and Methodology, University Autonoma de Madrid, Madrid, Spain.1Department of Psychology, University of La Frontera, Temuco, Chile.Italo Trizano-Hermosilla 1,2 * and Jesús M.
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