When developing a new software project, how much detail should you aim to include in your design document?
Design Docs: How Deep Should Your Blueprint Go?
Writing design documents is a critical practice for developers, whether working on solo hobby projects or at major tech giants like Google and Microsoft. A well-crafted design doc serves as a strategic blueprint, forcing engineers to think through important architectural decisions before any code is written. This process helps prevent costly mistakes and facilitates coordination among teammates and partner teams. However, finding the right level of depth is a significant challenge. One approach is to focus strictly on high-risk decisions where the penalty for being wrong is high, such as selecting a primary programming language. Conversely, over-detailing a document can lead to essentially writing the entire implementation during the design phase, which defeats the purpose of the document. As the article suggests, the level of detail should scale with the project's complexity and risk. For trivial decisions, such as whether to use a 'load more' button, a design doc may not be necessary at all. The goal is to articulate hard problems and solicit feedback without getting bogged down in implementation details.
Options
- Focus only on high-risk decisions with a high penalty for error
- Detailed documentation covering all implementation specifics
- A simple, universal one-pager regardless of project complexity
- Tailor depth based on the project's risks, goals, and team culture