04 / Product thinking & interaction
The interface starts
with a question.
Make the purpose clear, compare possible journeys and give the chosen direction a usable shape.
From a question to an interface
Decisions
before decoration.
- 01
Question
Who needs this, what are they trying to do, and what is still unknown?
- 02
Options
Map journeys, wireframes and alternatives. Compare the trade-offs.
- 03
Decision
Prototype the important interaction. Validate what can actually be tested.
- 04
Interface
Refine a responsive system with readable hierarchy, keyboard access and clear states.
Owned design example / Trips
A change should
explain itself.
Editing three nights to six changes the illustrative result. The original and edited assumptions remain in history, so the interface can show the path to the decision.
- Question
- What changed?
- Interaction decision
- Keep both versions inspectable.
- Working behavior
- Local Decision History survives restart.

Validation / Match the claim to the evidence
Responsive checks, interaction prototypes, contrast and keyboard review belong in the design process. Participant research and spoken assistive-technology testing must be recorded when performed; they are not implied by a polished prototype.