Marte Meo is a video‐based counselling method founded by Maria Aarts in the Netherlands and now in worldwide use (Aarts, Aarts Production, 2008). Marte Meo has been adopted and put into practice by a large and diverse network of trained and certified counsellors across the world. It was invented, developed and spread by a vanguard of practising counsellors who have adapted it to a variety of contexts. This is a classic example of research and theory emerging from and following practice; we first need to synthesise the lessons the practitioners and families have learned. We need to better understand how it is implemented; how it is viewed by its practitioners and recipients; and the extent to which variability in implementation may be an asset or a drawback in the continuing evolution of the programme, and in any eventual attempt to document its effects. Therefore, the present article aimed to address this important and hitherto unexplored research topic of the Marte Meo method in counselling and to describe the current state of use of Marte Meo. How is Marte Meo used and applied in a counselling and therapeutic context? Who uses Marte Meo in professional practice? Which function and which meaning does Marte Meo have in general practice and especially in counselling and therapy? What are typical concerns, goals or areas of application? We report on an ongoing mixed methods research project which began in 2015. This paper focuses on the research methods. We will explain why an integrated exploratory sequential design (Cresswell, 2017) is best suited to our purposes. The exploratory sequential design of the Marte Meo project has five phases: as the first phase, we conducted a systematic literature review, analysing the status of existing research. The staged qualitative research consisted of designing, conducting and analysing semi‐structured interviews with parents and Marte Meo counsellors (phase 2), and then using that analysis to inform the design, the conduct and the analysis of videotaped observations of everyday situations in day‐care centres to examine the process and effects of Marte Meo interaction elements on children (phase 3). Combining these qualitative analyses then became the basis for the development of an online questionnaire that could enable us to collect quantitative data on the current use of Marte Meo in practice by experts (phase 4). This builds into the fifth phase in the final interpretation. One of the key findings of the qualitative parts is that Marte Meo is perceived as advantageous. The experts reported more joy and success in their work. In particular, in the pedagogical context, the daily, resource‐oriented ‘Marte Meo view’, which was sharpened by the training, seems to be essential, as it enables an awareness of the needs of the interaction partners and the beneficial interaction elements. Moreover, for some interviewees the use of Marte Meo does not seem to be limited to professional practice, but is expressed in a general humanistic attitude towards interpersonal relation...