Questionnaire Development
The questionnaire was developed following the literatures on environmental behaviour and the previous applications of TPB, such as, Ajzen (1991) and Tonglet, Philips and Read (2004). As recommended by Ajzen (1991), a seven-point scale was used for the measurement. Krosnick and Presser (2010) have expressed that bipolar scales perform best with seven points, whereas unipolar scales performed best with five. For all measures, a seven-point Likert type scale was used with the anchors ranging from strongly disagree (1) to strongly disagree (7). The definitions of the variables used in the study are as follows.