This chapter focuses on survey methods for studying writing processes. We specifically focus on questionnaires, interviews, and process logs, which all represent subjective self-report instuments. We start by describing the affordances of these data collection procedures, and review some relevant L1 and L2 studies which employed them to study writing processes. We then address some methodological concerns in the use of the self-report instruments discussed in the chapter and finish by suggesting avenues for future research.