Input
What the buyer and engineering team must define
PRODUCT DEVELOPMENT
A staged path from requirement to mass production.
Development schedules vary depending on customization, tooling, certification and component platform. Multiple stages may run in parallel.
PROJECT LOGIC
Every stage needs an input, an output and a decision.
The purpose of a development plan is not to display a long timeline. It is to show what must be approved before cost, tooling, validation or production exposure increases.
Work
What is designed, built, tuned or evaluated
Output
What document, sample or decision is produced
Gate
Who approves movement to the next stage
DEVELOPMENT ROADMAP
Concept → ID → engineering → tooling → validation → production.
Reference timing is illustrative and not a fixed quotation or delivery promise.
01
Requirement / Concept
Reference: 1 week- INPUT / WORK
- Application, target user, market, must-have functions, price and forecast
- OUTPUT / GATE
- Approved product requirement and route recommendation
02
Industrial Design
Reference: 2–3 weeks- INPUT / WORK
- Concept direction, brand language, fit and CMF inputs
- OUTPUT / GATE
- Reviewed ID direction and surfaces
03
Mechanical Design
Runs with ID / platform review- INPUT / WORK
- Internal layout, housing, case, interfaces and assembly constraints
- OUTPUT / GATE
- Mechanical definition ready for sample or tooling review
04
Electronics & Firmware
Reference: 2–3 weeks where development applies- INPUT / WORK
- Bluetooth, power, charging, microphone, controls and function logic
- OUTPUT / GATE
- Controlled hardware / firmware configuration
05
Acoustic Tuning
Reference: 1–2 weeks- INPUT / WORK
- Driver, cavity, microphone path, target signature and reference
- OUTPUT / GATE
- Tuning candidate and approval criteria
06
Tooling
Reference: 3–4 weeks where new tooling applies- INPUT / WORK
- Frozen geometry, materials, tolerances and mold review
- OUTPUT / GATE
- Tooling samples and issue list
07
EVT
Engineering verification stage- INPUT / WORK
- Engineering samples, functions, interfaces and initial risks
- OUTPUT / GATE
- Engineering issue closure plan
08
DVT
Design validation stage- INPUT / WORK
- Design-intent units and project-defined test matrix
- OUTPUT / GATE
- Evidence for design approval or corrective action
09
Compliance & Packaging
Often runs in parallel- INPUT / WORK
- Destination markets, evidence gaps, labels, manual and packaging
- OUTPUT / GATE
- Approved market files and packaging configuration
10
PVT / MP
Pilot then mass production after approval- INPUT / WORK
- Released BOM, process, inspection criteria and approved sample
- OUTPUT / GATE
- Production release and released mass-production baseline
BUILD & VERIFY
Use build samples to close development issues.
Engineering builds connect the released configuration with assembly feedback, functional review and the next approval gate.
Sample build environment
Sample purpose, configuration, open issues and approval status needs to be recorded for each build.
Workflow visuals support process discussion. Production location, equipment availability and project evidence are confirmed separately for the selected program.
PARALLEL WORK
Not every activity waits in a straight line.
Selected workstreams can overlap after the necessary inputs are stable.
ID + mechanics
Packaging concept can begin while mechanical feasibility is reviewed
Electronics + firmware
Function definition and hardware interfaces are coordinated together
Acoustics + mechanics
Cavity and microphone-path changes are reviewed before freeze
Compliance + packaging
Market marks, manuals and transport needs feed packaging approval
SCHEDULE VARIABLES
What can change the development plan.
New tooling, component availability, sample revisions, firmware scope, acoustic targets, test failures, certification actions and buyer approval timing can change the sequence or duration.
Customization depthTooling requirementComponent platformFirmware and app scopeValidation failuresCompliance destinationsPackaging complexityApproval response time