What is Design Rationale?
While a spec document outlines the "what" of UX design, your design rationale explains "why" you did what you did.
Your design rationale is likely in a constant state of flux as you build, so it's easy to forget your thinking process along the way. That's why meticulously logging your design decisions is essential.
Pro tip: Point out any cases where there are unknowns, and clarify your confidence level. You can say, "We haven't figured this out yet, but we're building this so we can test whether it works."
Your Design Rationale
Decision #1
Best Practices
Document as You Go
Don't wait until the end of the project. Log decisions while they're fresh in your mind.
Include the Context
What data, research, or constraints influenced this decision? Future you will thank you.
Be Honest About Unknowns
If you're not sure about something, say so. Note what you're planning to test or validate.
Keep It Concise
Focus on key decisions, not every tiny detail. Your rationale should be scannable.
Share Your Design Decisions
Use this template regularly to build a history of your design thinking