A subject matter expert, often shortened to SME, is the person whose knowledge a piece of content depends on: the clinician behind a health page, the policy lead behind eligibility guidance, the engineer behind a technical guide. It’s a part people play alongside their main job rather than a job title. The responsibility usually covers supplying knowledge, checking substance and saying when something has changed.
Expertise in a subject doesn’t automatically include expertise in explaining it. The strongest work pairs subject authority with content craft (through pair writing, for example) rather than expecting one person to provide both.
Why it matters for content
Subject experts understand exceptions, evidence and consequences that writers may miss. They can identify where simplification becomes inaccurate and where an apparently small wording change alters policy or technical meaning.
Collaboration works best when responsibilities are clear. The expert provides subject authority, while the content specialist shapes structure, language and the experience around it. Final approval rights still need to be assigned for the task; expertise doesn’t automatically make someone the publisher or sole approver. Pair writing can resolve questions faster than sending drafts through serial review.
The responsibility also needs time that’s recognised in the expert’s actual job. Reviews squeezed between other work tend to arrive late, or not at all, and a page waiting on one busy person is a page going out of date. Focused questions, clear deadlines and visible decisions produce better input than asking someone to “check everything”.
How AI changes the picture
With appropriate consent and data handling, AI can capture interviews, organise notes and turn expert sources into a first draft, which makes the expert’s contribution quicker to gather. It can also fabricate plausible detail, so expert verification matters more for consequential material.
The responsibility is also moving upstream. When AI agents answer questions from an organisation’s own sources, an expert’s knowledge reaches readers through those sources as well as through reviewed pages. Keeping them accurate, writing test cases that show whether an agent handles difficult questions correctly and defining when it should hand over to a person all become part of the expert’s contribution. Knowledge kept only in one person’s head or inbox can’t do that work.
Questions people ask
- Should the expert write the first draft?
Not necessarily. A writer can draft from an interview or source material while the expert checks substance.
- Who decides when clarity and precision conflict?
A subject matter expert and an editor should find language that preserves both. If a technical term is necessary, explain it rather than removing it.
- How many experts should review?
For a routine technical update, one expert in that subject may be sufficient; a change crossing safety and legal requirements may need both specialisms. Name what each reviewer checks and who resolves disagreement. The number follows the scope, not a quota.
- Can AI become the subject expert?
No. It can represent supplied knowledge, but it doesn’t hold responsibility or guaranteed current expertise.
Learn more
- Working well with subject matter experts – six practical, humane tips from Defra content designers on trust, roles and working through resistance.
- Working effectively with subject matter experts – a useful guide to balancing technical authority with audience-centred content practice.
- Collaboration between designers and subject experts – A 2023 study of instructional designers and subject experts in online learning; relational working in that setting, not a finding about every digital project.