Design computing research, a subfield of design science, focuses on developing computational frameworks and tools for design-related activities. Growing interest in the field has resulted in an abundance of academic resources. To help researchers utilize these, we enumerate and organize the research questions pursued across design computing research, regardless of a specific design discipline or method. An existing taxonomy derived from a single venue (DCC) was applied to the recent proceedings of two additional venues (E&PDE, CAADRIA). This process has yielded a revised taxonomy that can account for the recent proceedings (2024) of all three conferences (N = 253), thus demonstrating potential for generalization. The taxonomy classifies works in the field into three major categories: (A) explanation of design-related activity, (B) application of knowledge for enhancing design-related activity, and (C) organization of knowledge on a meta-level. For each category, the corresponding questions and sub-questions are listed, and example papers are provided in the form of an index. A complementary computational exploration of clustering using machine learning has further highlighted the potential usefulness of the taxonomy. These categories can help researchers position their work in a broader context, support design computing pedagogy and help to create a map for the field.