The Design Process
Product design follows an iterative cycle: Define → Research → Ideate → Prototype → Test → Iterate. Unlike a linear process, engineers loop back whenever testing reveals problems. The goal is to fail fast and cheaply early — before manufacturing thousands of units.
Design Brief
A design brief is a written document that defines the problem, the target user, design requirements, constraints, and success criteria. It guides every decision in the design process. A good brief is specific enough to focus the team but flexible enough to allow creative solutions.
Prototyping
A prototype is a physical or digital model built to test a specific idea quickly. Low-fidelity prototypes (cardboard, foam, sketches) are cheap and fast — great for testing basic concepts. High-fidelity prototypes (3D printed, machined, coded) look and work like the final product — used for final validation before manufacturing.
Testing & Iteration
Testing reveals whether your design meets its requirements. Use real users whenever possible. Document what works and what fails. Iteration means returning to an earlier stage to improve the design — most successful products went through dozens of iterations before launch.
Decision Matrices
When choosing between design concepts, a decision matrix (also called a Pugh matrix) scores each option against weighted criteria. This makes design decisions transparent, repeatable, and less biased by personal preference. Criteria might include: cost, weight, manufacturability, user experience, and durability.