For the questionnaire’s validity and reliability, the first draft of the interview questionnaire was prepared in consultation with graduate professors. The draft was then submitted to the research adviser for comments and suggestions. The improved draft was presented to a committee for further comments and suggestions. This instrument was pre-tested with a group of tuk-tuk drivers, similar in stature to those who were to be respondents, but who did not take part in the study itself. Improvements were possible as a result of this pilot study. Informal interviews were also conducted and were helpful as a basis for revision of some of the items in the questionnaire.