A simple 3-layer system to organize the Design Review process.
If you’re working on a regulated medical device, a “design review” can feel like a black hole.
10 people dive into the technical details, marking up the same Word export. Requirements keep changing underneath you. Someone has to manually reconcile comments back into the requirements tool. By the time the review is “closed,” nobody is totally sure what version was actually reviewed.
And in the back of your mind is the 510(k): “If an auditor pulls this thread two years from now, will it hold?”
I’ve sat through enough design reviews to know when they’re going off-track. The problem isn’t the specific tools you’re using. The problem is that checking and reviewing are getting blended into one giant event with no clear owner or frozen baseline.
You don’t need a new tool to fix that. You need a simple structure.
Chad is a professional engineer and has spent over 25 years leading complex engineering projects in medical device development and defense systems. He's been hands-on from early-stage prototyping to full-scale manufacturing, giving him unique insights into the challenges of bringing devices to market. Chad is always thinking about how to improve the development process to help clients save on manufacturing costs without reducing quality.
The Core Distinction: Checks vs Design Reviews
Some teams are actually trying to do four different things inside one chaotic “design review”:
- Check if parts are manufacturable
- Check assembly fit and part tolerances
- Check if requirements are traced to specs and evidence
- Formally review the design at a defined phase for regulatory purposes
When all of that happens in one pass? You get version confusion, unclear ownership, review records that are hard to defend later. The fix is to separate detailed discipline checks from the formal design review and tie everything to a frozen snapshot.
We recommend a three‑layer system.
Layer 1: Discipline Checks (Asynchronous)
Each function checks its own artifacts before anything is called “ready for design review.”
Examples:
- Mechanical / Industrial
- CAD and drawings checked by an independent engineer
- Fit, form, tolerance stacks, materials, surface finishes
- DFM/assembly concerns flagged early
- Electrical / Firmware / Software
- Schematics, layouts, state diagrams, software requirements
- Interface definitions between subsystems
- Safety‑related behaviors and mitigations
- Manufacturing / Test / Quality
- Assembly and test procedures
- Special processes, jigs, fixtures
- Inspection plans for critical characteristics
Each artifact has a preparer and a checker. Comments live in whatever tool is natural for that team (PLM, code review, marked‑up PDFs), but the key is: by the time you get to a formal design review, every item in scope has been checked once by someone other than its author.
Layer 2: Traceability Pass with a Frozen Baseline
Separately from discipline checks, someone owns the traceability matrix:
- Each requirement is mapped to:
- Design specification(s)
- Verification method and evidence (test, analysis, inspection)
- Risk controls where applicable
Before the design review, you:
- Export a snapshot from your requirements / test tool (or even Excel)
- Give that snapshot a unique ID and date
- Use that snapshot as the reference in the design review agenda and minutes
If requirements evolve later, you don’t lose history. The review record still points to a specific baseline that reflects what was actually reviewed at that time.
This is what auditors follow when they start “pulling threads.”
We wanted to thank Root3 Labs for their time and expertise on our project. They consistently meet our complex challenges with practical solutions.
Layer 3: The Formal Design Review
By the time you’re in the room (or on the call), you’re no longer line‑editing documents. You are:
- Confirming that discipline checks were completed and issues resolved or consciously accepted
- Reviewing high‑risk FMEA items and how they’ve been mitigated
- Surfacing any marginal requirements (barely met, or sensitive to manufacturing variation)
- Calling out tight tolerances or process fragility that could affect yield and reliability
- Ensuring there are no orphan requirements without specs or verification evidence
I’ve noticed teams skip the frozen baseline because it feels like bureaucracy. Then they spend three days reconstructing what they reviewed. Instead, the meeting output should be:
- A list of artifacts and the baseline ID that were in scope
- Decisions and actions for any open risks or gaps
- Signatures / approvals tied to that specific review
That’s the “evidence trail” you need for 21 CFR 820.30 and ISO 13485 audits, without burying your team in busywork.
What If You’re Still Stuck in Word and Email?
This system works even if you don’t have a fancy requirements tool:
- Discipline checks: PDFs or slide decks with mark‑ups, stored in a structured directory or PLM.
- Traceability pass: Excel matrix exported and version‑controlled.
- Design review: Agenda and minutes in Word, clearly referencing the matrix version and list of artifacts.
The value doesn’t come from the software. It comes from:
- Clear owners (preparer, checker, review chair)
- Separate stages (checks, traceability, formal review)
- Frozen baselines per review
If you’re working toward a 510(k) submission
We built this structure the hard way, by living through real audits and tight timelines with device manufacturers under pressure. We offer short engineering design reviews focused on catching tolerance issues, material choices, and assembly risks before expensive decisions get locked in.
If you want a sanity check on your next prototype iteration before you commit to tooling, leave a comment below or send me a note and a brief description of the assembly.
