المستخلص
The current study aimed at investigating the possibility of predicting ordinal alpha, ordinal theta, omega, and the greatest lower bound reliability with Cronbach's alpha coefficient through verifying the correlative relationship between the alpha coefficient and other reliability coefficients, and studying the differences in reliability coefficients according to different sample sizes .Six scales (The Satisfaction With Life Scale (SWLS), Perceived Stress Scale, Global Self-esteem Scale, Body Appreciation Scale-2, Beck Depression Inventory Short Form (BDI-SF), and the International Personality Item Pool designed to measure Cattell's 16 personality factors) were applied on a sample comprised (800) male and female students distributed into five sub-samples (50, 100, 150, 200, 300). Results revealed the preferences of ordinal alpha coefficient, ordinal theta, the greatest lower bound coefficient, and then the omega coefficient over Cronbach's alpha coefficient, there was a positive correlative statistically significant relationship between the reliability coefficients, there were no significant differences in the reliability coefficients due to the difference in the sample size, and the possibility of predicting reliability coefficients (ordinal alpha, ordinal theta, the greatest lower bound, omega) given Cronbach's alpha coefficient. The research recommended the significance of using ordinal alpha, ordinal theta, omega, and then the greatest lower bound to the reliability as alternatives to Cronbach's alpha coefficient
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