Accept a design handoff when the priority journey and its recovery states are understandable, and engineering can see both the decisions and the open questions.
Start with a decision to make
A design engagement should help resolve an uncertainty: whether people understand an offer, whether they can finish a task, or how a growing product should behave consistently. Define that question before counting screens.
For a service enquiry, success may mean customers know what to request and the team receives enough context to respond. Both sides of the handoff belong in the design.
A worked example
Inspect a service-enquiry design handoff.
An illustrative review: engineering is about to turn an approved prototype into a working customer journey.
Main task
Follow service selection, request details and confirmation on mobile.
What to check: The prototype communicates the intended behaviour.
Missing states
Check loading, invalid input, failed submission and empty content.
What to check: Engineering does not have to invent the recovery journey.
Ready to build
Review reusable patterns, content and unresolved decisions together.
What to check: The next stage has a clear scope and an implementation owner.
Expect more than finished screens
A focused scope can include a journey map, content hierarchy, clickable prototype, responsive layouts, and component states. Ask to see loading, empty, validation, and confirmation behavior as well as the attractive main screen.
The prototype should let reviewers follow the task. It is a way to inspect a decision before development, not evidence that the final product already works.
Make feedback specific
Review the design against the agreed task. Ask what someone understands, where they hesitate, and whether they can explain the next step. When representative users are available, record observations rather than only collecting preferences.
Separate a usability obstacle from a visual preference. Both can matter, but they need different decisions and should not be treated as the same finding.
Prepare the engineering handoff
Developers need behavior, content, responsive rules, and reusable patterns alongside design files. Record what has been decided, what still needs testing, and which states require implementation.
Agree whether production development is included. A clear handoff makes the next stage easier; it does not automatically include a working website, integrations, or ongoing product changes.
Try it
Inspect one complete journey.
Choose one journey in the prototype and follow it as a new user. Keep a list of missing states and unresolved behaviour for the engineering handoff.
- Define the user and task.
- Check success, error, and empty states.
- Review the mobile and keyboard journey.
- List the files and decisions engineering needs.
Aim for: A design handoff checklist: priority journey, responsive screens, success/error/empty states, interaction notes, reusable patterns and unresolved validation questions.
Then decide: Proceed to engineering when the priority task is understandable and the missing states are resolved. Keep a prototype review in scope if the team still cannot agree on the intended behaviour.
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