Interactional data is often central to research in plurilingual learning environments. However, getting a grip on the processes of collecting, organizing, transcribing, analyzing and presenting audio and/or visual data is possibly the most exciting, but also one of the most challenging things about learning to do qualitative research. Although the entire process is interwoven with other aspects of research discussed elsewhere in this handbook (e.g. ethics, qualitative research design), this chapter attempts to set out some basic recommendations to guide the reader through different stages of what Mortensen and Hazel (2012) have called the "data cycle". Sources for recommend reading are provided. [A Spanish version of this chapter is also included in the book. For the complete volume, "Qualitative Approaches to Research on Plurilingual Education," see ED573580.]