How to Write a Technical Design Proposal Review Comment in English
A practical English guide for reviewing technical design proposals — how to phrase concerns, ask clarifying questions, and approve with confidence.
Reviewing a technical design proposal is different from reviewing code — you’re evaluating an idea before it’s built, often across teams or time zones, entirely in writing. For non-native English speakers, finding the right tone matters as much as the technical substance: too soft and your concern gets missed, too blunt and it reads as dismissive. This guide gives you vocabulary and phrases for writing clear, constructive design review comments.
Key Phrases
Flagging a risk — pointing out a potential problem without asserting it will definitely happen. “One risk I’d flag here: if traffic spikes during the migration window, the fallback path isn’t described.”
Asking for clarification — requesting more detail on a part of the proposal that’s ambiguous or underspecified. “Could you clarify what happens if the downstream service times out during step 3?”
Requesting a trade-off comparison — asking the author to justify a decision by comparing it to at least one alternative. “Did you consider a queue-based approach instead of synchronous calls here? It might be worth a sentence on why it was ruled out.”
Conditional approval — approving the proposal contingent on a specific change or clarification being made. “I’m broadly on board with this. Once the rollback plan is added, I’m happy to approve.”
Scoping concern — raising a question about whether the proposal is trying to solve too much or too little at once. “This feels like it might be two separate proposals — should we split the migration plan from the new API design?”
Non-blocking suggestion — a comment that expresses a preference but shouldn’t stop the proposal from moving forward. “Nit, non-blocking: I’d probably name this service something more specific than ‘processor’, but not a big deal.”
Surfacing a precedent — referencing a similar past decision or existing system to inform the current discussion. “We ran into a very similar issue with the payments service last year — worth checking how that was resolved before repeating the pattern.”
Requesting a diagram — asking the author to add a visual aid because the written description is hard to follow. “A sequence diagram here would help — I’m having trouble tracking which service initiates the retry.”
Common Phrases for Different Review Situations
- “I want to make sure I understand the failure mode here — what happens if the cache is unavailable?”
- “This section reads a bit ambiguous to me. Are we saying the migration is reversible, or one-way?”
- “I don’t see a strong objection here, but I’d like a second opinion from someone on the data team before we finalise this.”
- “Overall this looks solid. My main concern is around the timeline — three weeks feels tight given the dependencies listed.”
Structuring a Thorough Review Comment
A clear review comment usually follows a simple structure: state the concern, explain why it matters, and suggest a path forward.
- “The proposal doesn’t cover what happens on partial failure. This matters because a half-completed migration could leave data in an inconsistent state. Could we add a section describing the rollback procedure?”
- “I noticed the schema change is described as backward-compatible, but I don’t see how old clients would handle the new required field. Would a default value solve that, or am I missing something?”
Phrases to Avoid
| Avoid | Try instead |
|---|---|
| ”This won’t work." | "I’m not sure this handles the retry case — can we walk through it?" |
| "You forgot about X." | "I don’t see X addressed — was that intentional, or should we add a section?" |
| "This is too complicated." | "Is there a simpler version of this that would meet the same goals?" |
| "I don’t like this." | "I have a preference for a different approach here — can I explain my reasoning?” |
Practice Exercise
- Write a review comment (3-4 sentences) flagging a missing rollback plan in a design proposal, without sounding accusatory.
- Write a conditional approval comment for a proposal you mostly agree with but that’s missing one important detail.
- Rewrite the blunt comment “this design is overcomplicated” into a constructive, specific alternative.