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In this chapter we outline some of the ways in which quality can be achieved when conducting qualitative research and how quality can be demonstrated in qualitative research outputs (particularly articles and dissertations/theses). We make use of a binary distinction by categorizing some research as qualitative and other research as quantitative. We acknowledge the limitation of this qualitative–quantitative binary, and we go some way towards redressing that limitation in our section on triangulation, in which we talk about how quality can be enhanced by comparing various forms of data. We draw on a range of systems of quality criteria that have been put forward for qualitative research in recent decades. In each of these systems different terminologies are created, extended or reconstituted. The most highly cited system of quality criteria for qualitative research is that developed by Guba, Lincoln and colleagues (Guba, 1981; Lincoln, 1995; Lincoln & Guba, 1985; Lincoln et al., 2011). They continue to advocate for five key concepts that can be used to assess the quality of qualitative research: credibility, transferability, dependability, confirmability and authenticity, which are described in Box 5.1. This chapter is split into four sections. We start by outlining the concept of transparency as an overarching way of thinking about quality in research. We then detail three additional facets of quality for qualitative research: personal reflexivity and end-user involvement; the transferability of findings; and triangulation of data sources (Box 5.2). Throughout this chapter we also attend to how facets of quality for qualitative research diverge from markers of quality …