This study is to analyze the validity and reliability of Melbourne Decision Making Questionnaire (MDMQ). The sample consisted of 650 university students. The structural validity of the MDMQ, as well as correlations among its sub-scales, measure-bound validity, internal consistency, item total correlations and test-retest reliability coefficients were determined. A confirmatory factor analysis found that the measure was compatible with the five sub-dimensions as depicted in the original scale and all items were well-placed in related sub-scales. Additionally, Cronbach's alpha coefficient was found for the sub-scales such as self-esteem, vigilance, buck-passing, procrastination and hypervigilance 0.80, 0.82, 0.77, 0.75 and 79 respectively. In the same vein, test-retest consistency was rated as 0.82, 0.75, 0.83, 0.71 and 0.72. In the light of this statistical analysis, MDMQ has proven to be a valid and reliable measuring scale for determining levels of self-esteem and decision-making styles of university students.