Reliability is defined as the proportion of observed score variance that is attributable to true score variance. There are several methods to establish the reliability of a measuring instrument and the internal consistency method is the most commonly used method in studies with cross-sectional design. The internal consistency is estimated using a reliability coefficient called Cronbach’s alpha (˛) (Cronbach, 1951).An˛value of 0.70 or above is considered to be the criterion for demonstrating strong internal consistency of established scales (Nunnally, 1978). In the case of exploratory research, ˛ value of 0.60 or above is also considered as significant (Hair et al., 1998).