Designing is a complex, multifaceted phenomenon including human, artefactual, process, economic, social, and environmental dimensions (amongst others). Design research has traditionally employed a broad range of methods and theories, some taken from other fields and others uniquely developed for studying design. It also produces a variety of outcomes, including research papers, design tools, design methods, and designed artefacts. We are therefore a diverse community that produces rich research insights from multiple perspectives. In order for the field to further mature it is necessary to reflect on, and build, research quality. For example, addressing challenges of methodological diversity and development, knowledge construction, and research relevance. This VSI and ongoing collection seeks to bring together key discussions on these topics in design research. It can be difficult to appreciate the differences in worldviews and perspectives arising from different methodological and theoretical orientations of design researchers. It can also be challenging to keep track of the evolution in approaches that naturally occurs within the scope of Design Studies and related journals. Hence, the Research Notes in this VSI and the ongoing collection will create: 1) a common forum for the discussion of research issues in studies of designing; 2) an evolving reference source for best practices in research methodology, theory development, and scholarship; and impact of design research; 3) a platform for developing the quality, relevance, and impact of design research.