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Meetings & Communicationnoun · /dɪˈzaɪn dɒk/

design doc

In simple English

A design doc is a formal technical document created during the planning phase of software development. It serves as a blueprint for engineers, designers, and stakeholders, explaining what will be built, how it will work, and why certain technical decisions were made. Design docs are typically reviewed and approved before engineering work starts, helping teams align on requirements and reduce costly mistakes during development. They range from simple one-page outlines for small features to comprehensive multi-page documents for major system redesigns, and often include diagrams, API specifications, database schemas, and risk analysis.

Understand what a design doc is and why tech teams write them before starting development

At a glanceCEFR B2
Commonness5/5
Versatility4/5
FormalityCasualFormalNeutral
Spoken ↔ WrittenSpokenWrittenBoth
Directness ↔ DiplomaticDirectDiplomaticDirect
RegionUS and UK
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Say it like this

✓We need a design doc for this before we kick off
✓Can you send over the design doc?
✓Let us review the design doc in today is meeting

Real examples

in a standup

"We are blocked on the API changes until the design doc is approved by the tech lead."

in a planning meeting

"The design doc outlines three possible approaches; let us discuss the trade-offs of each."

in an email

"I have published the design doc for the authentication redesign here; please add comments by Friday."

Don't say this

Handle with care. Do not use as a verb (saying we need to design doc something). It is a noun referring to a document, not an action.

✕We need to design doc this feature tomorrow.
✓We need to write a design doc for this feature tomorrow.— Design doc is a noun, not a verb. You write or create a design doc, not design doc something.
✕Let us start coding; we can do the design doc later.
✓Let us write the design doc first, then start coding.— Design docs should be written before development begins, not after. Writing it later defeats the purpose.
✕The design doc is ready, so we are done with design.
✓The design doc is approved, so we can start implementation.— A design doc is only the planning stage; implementation and testing still follow.

Other forms

noun

design doc

"The design doc was 15 pages long."

noun phrase

design doc review

"We scheduled a design doc review for next Tuesday."

Often used with

write a design docThe most common action; creating a design doc from scratch
review a design docReading and providing feedback on someone else's design doc
approve a design docFormally accepting the design doc so development can begin
design doc templateA standard format or structure companies use for all their design docs

Similar words

design documentFormal, full version of design doc; same meaning, slightly more formal
technical specificationSimilar but slightly broader; may focus more on technical details than high-level design
proposalLess technical; emphasizes the what and why rather than the how

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. Your team is about to start a major project. What do you say?

Complete the sentence

2. Before we implement the search feature, we need to _______ and get feedback from stakeholders.

Spot the mistake

3. Which sentence uses 'design doc' incorrectly?

Rewrite naturally

4. Rewrite this in natural tech English using 'design doc': 'We need to write down the plan for how this system will work before anyone starts programming it.'

Questions

Quick poll

Have you said "design doc" in a standup this week?

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