This chapter aims to help you identify the factors that you should consider in choosing and working with a supervisor. The choice of supervisor is, for many students, the first critical decision in undertaking a thesis. The right supervisor can help you to produce a better thesis, and do it faster, while providing you with valuable experience and contacts. Choosing the wrong supervisor will add further tensions to the usual stresses of a thesis, and in the most extreme cases can result in students dropping out or restarting on a new topic with another supervisor, causing a substantial delay in completion. So choosing the right supervisor is obviously important. But how do you tell who will be the 'right' supervisor for you? The same academic might be a fantastic mentor and supporter to one student and the 'supervisor from hell' for another student. In this chapter we discuss three fundamental issues in the student/supervisor relationship: appropriate expectations, how to choose the right supervisor for you, and how to work most effectively with your supervisor. We discuss some of the ways to work out whether a potential supervisor will be right for you, how to make yourself attractive to a potential supervisor, and how to manage the relationship with a supervisor once you are working together. The chapter concludes with a discussion of the codes of supervisory practice that exist in some universities, and what these mean for you as a student.