Design Decision Justification Questions
Part of the UI/UX Design Roadmap
In short
'Why a bottom sheet and not a new page?' Interviewers ask this to see if your choices were deliberate. 'It looked nicer' is not an answer.
'Why did you choose this layout over an alternative?' — testing whether your decisions were deliberate and reasoned, not just aesthetic preference.
Think of it like this
Explaining your college choice to your parents
Your parents ask why this college and not the other. 'It felt right' won't work. You explain: better placements for your branch, fees within budget, closer to home. You also admit the hostel is worse. That's how to justify a design.
Watch it happen
Answering 'why did you choose this?'
1/5Goal: 'Users needed to change seats without losing their booking.'
The big ideas
What you need to know
Tie it to users
Every choice should connect to a user need, a business goal or a constraint.
Name the trade-off
Every choice has a cost. Saying it out loud shows maturity, not weakness.
Use principles too
When you lack data, cite a known principle or platform guideline, and say so honestly.
It's fine to rethink
'With what I know now, I'd test X' is a strong answer when you're unsure.
See it in code
Walk through the code
1Q: Why tabs instead of a side menu?2 3A: The goal was quick switching between 3 sections.4I sketched both. With only 3 sections, tabs keep5everything visible in one tap. A menu hides them.6In testing, people found sections faster with tabs.7The cost: tabs won't scale past 4 or 5 sections,8so if we add more, I'd revisit this.1/3Start with the goal and show you considered options.
A justification answer that covers goal, options, reason, evidence and trade-off in under a minute of speaking.
Save yourself the pain
Common mistakes
Oops
Getting defensive when asked 'why?'
Do this instead
Treat it as curiosity. Calmly walk through goal, options and evidence.
Oops
Answering with taste: 'it felt cleaner'.
Do this instead
Connect the choice to users, data, principles or constraints.
Your mission
Five whys drill
Quick check
An interviewer asks why you used a dropdown. You have no test data. What's the best answer?
Go deeper
- 1Prepare a specific rationale for 3-4 key decisions in your strongest case study.
- 2Practice answering 'why not X instead?' for your primary design choices.
- 3Learn to acknowledge trade-offs honestly rather than defending a choice as flawless.
More portfolio & case studies at this stop
Presenting a Case Study
Explaining Failed Design Ideas
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