The purpose of this paper is to offer a comprehensive guide for novice researchers (mostly applicable to PhD students and those new to qualitative research), teachers, and reviewers of qualitative psychology research methods. This paper delineates the main quality criteria across qualitative methods: providing a holistic framework that covers fundamental principles as well as nuanced, context-specific guidelines relevant to a chosen qualitative approach. First, we demonstrate why this overview is needed, in part because of an increasing emphasis on finding sound ways of appraising qualitative studies, the lack of agreement on quality markers, and the variety of qualitative research methodologies available. Next, we present general criteria for quality across all qualitative methods, before setting out method specific criteria for four commonly used qualitative research approaches: Reflexive Thematic Analysis (RTA), Interpretative Phenomenological Analysis (IPA), Critical Discursive Psychology/Discursive Psychology (CDP/DP) and Constructivist Grounded Theory (CGT). While the focus is on providing criteria specific to these methodological approaches, we also describe the broader philosophical foundations underpinning these approaches and other branches within these philosophies, recognising that methodological criteria can be contrasting and competing even within methodologies. The integration of general and approach-specific criteria cultivates a deeper understanding of both the philosophical underpinnings and practical intricacies of qualitative inquiry, empowering researchers to navigate the methodological landscape with critical acumen and intellectual humility. Finally, we compare the four methodologies in terms of key features and qualities they aim to achieve. The paper emphasizes that even though there are criteria that are common across the field, it is essential to maintain the specific stance of each individual methodological approach.
