To avoid confusion, vagueness, and misinterpretation caused by the
participants, the instrument employed in the study was semi-structured interview
conducted in Thai. The semi-structured interview was employed by asking all
participants the same set of questions in the same order. Moreover, the questions
allowed the participants to express their personal thoughts and provide comments,
suggestions and opinions. In addition, the semi-structured interview gave an
opportunity for the participants to ask questions and I was able to give language
clarification (Robinson, 1991).