The success of a thesis or a dissertation for a graduate student relies upon the roles of their supervisor. The student not only needs to be equipped with the knowledge, but also be able to manage others and external factors at the same time. The journey during the period of conducting research is mixed with various tasks. Five supportive roles of a supervisor involving the supervision system are specific technical support, broader intellectual support, administrative support, management, and personal support brings about the output of the study. A supervisor's roles for successful thesis and dissertation is reported by using the survey on graduate students in the universities in Thailand probing for the current practices of supervisor and the expectation of student towards the supervisor's roles. The reflection from the students' perspective can help develop relationship between supervisor and student for undertaking a successful thesis and dissertation. (Contains 2 tables.)