Although content validity is subjective and judgmental (Flynn et al:, 1990) it can be used in conjunction with other methods of validity assessment to provide corroborating evidence based on two standards suggested by Nunnally: does the instrument contain a representative set of measures, and were sensible methods of scale construction used? In this study the items used to measure the constructs were adopted from previous scales found to be valid and reliable and pilot tested with logistics managers to ensure that the items tapped the domain of the construct.