QX TECH / BUYER’S GUIDE

Wearable development.
From brief to build.

A practical stage-gate framework for a wearable project, with the decisions and evidence to agree before the next commitment.

The decision in brief

A useful wearable development plan names the output of each stage, the person who accepts it and the changes that reopen it. It should cover hardware, firmware, the app and production together. The framework below is a planning tool—not a fixed QX lead-time promise or a claim that every project requires the same phases.

Agree on the gates before the dates

An existing-product order and an entirely new design should not be forced into one schedule template. Agree which evidence already exists, whether it applies to the intended configuration, and what additional work remains. Use the table as a working agenda for the quotation and kickoff.

Agree on the gates before the dates
StageWorking outputDecision before moving on
BriefUse cases, target users, markets and constraintsThe product problem and exclusions are understood
FeasibilityPlatform review, architecture and high-risk testsCritical dependencies and unknowns are explicit
PrototypeIntegrated device, firmware and app demonstrationThe intended experience is feasible under agreed conditions
ValidationTest results and issue closureFailures have owners; acceptance thresholds are met
PilotTrial assembly and production test evidenceBuild instructions, yield issues and traceability are addressed
ProductionApproved configuration, QC and shipment recordsRelease and shipment responsibilities are assigned
LifecycleUpdate, repair and support arrangementsLong-term ownership and change control are documented

Keep one configuration under review

Name the hardware revision, firmware build and app build on every test record. A battery result from one firmware version cannot silently validate another. Record whether samples use final materials and production processes or prototype substitutions.

Maintain a short issue list with severity, reproduction steps, owner and retest evidence. A demonstration video can show a flow; it does not replace a reproducible acceptance test. Ask what happens during a failed update, an interrupted sync, a discharged battery and a device replacement.

Make handover part of the product

Request the agreed design files, build instructions, production records and operating documentation. Clarify access to code repositories, app-store accounts, cloud accounts, signing credentials and third-party licenses. Not every project includes source-code transfer; the signed agreement must say what is included.

Before committing to dates, identify dependencies outside the supplier’s control: customer approvals, component availability, third-party accounts and any applicable testing or qualification. Separate those dependencies from the team’s engineering work so delays can be addressed rather than hidden.

A useful next step