**16.2 Validity**

Face and content validity were tested for this study. The face validity of the knowledge scale is the extent to which the respondents perceived that the knowledge scale is measuring the knowledge of SSBs; and content validity refers to the "extent to which the measurement was representative" of all aspects measuring the SSBs ([33]:212).

Both the 'face and content validity' ([33]:212) were tested through piloting of the questionnaire and feedback received from the respondents on the content of the questionnaire, that is, the logical flow, the ambiguity and the terminology.


**Table 2.**

*Internal consistency reliability values of scales.*
