The version of the “5 Cs” used in this article asks that every professional message be clear, concise, concrete, correct, and courteous. Before you send a message at work, test the draft against those five words. The phrase “5 Cs” is not a single fixed list, though. Different publishers use different words for the same idea, so treat this as one defensible checklist rather than an official standard.
Which version of the 5 Cs this article uses
Several sources describe a “5 Cs” model, and they do not agree on every word. The table below lists the versions found in the sources cited here, with their dates where the source states one.
| Source | Date stated | Five terms listed |
|---|---|---|
| University of British Columbia-hosted writing course PDF | Course material dated 2016 in the retrieved listing | Correct, clear, concise, consistent, complete |
| Petroleum and Natural Gas Regulatory Board press note | March 30, 2026 | Clear, concise, concrete, courteous, correct |
| Connecting Across Cultures: Strategies for Inclusive Communication in Global Workplaces, a workplace guide from The Diversity Movement | Not stated | Clear, concise, complete, correct, courteous |
| Prezent business communication article | Updated July 30, 2026 | Full list not stated in the available excerpt; the article’s variants substitute completeness, consistency, coherence, or compassion for one or more terms |
This article uses the regulatory press note’s version, clear, concise, concrete, correct, courteous, because it is the most specific of the official-sector versions and it matches the workplace guide on four of five terms. The one difference is that the workplace guide says “complete” where this version says “concrete.” The concrete test below covers much of the same ground, because a message that includes the facts needed to act is complete for that purpose. Readers who prefer “complete” can substitute it without changing the checks.
The five tests, one at a time
Clear: the recipient can tell what you need
Clarity means stating the purpose early and using language the recipient can understand without guessing. The press note associates clear communication with simple, unambiguous language. A practical test is to ask whether the recipient could repeat, in one sentence, what you want from them. If they could not, the message is not clear yet, however polished it reads.
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The UBC-hosted course material gives similar advice: use simple sentences and paragraphs with a logical order, so each point follows from the one before it.
Concise: say only what matters
Concision means removing repetition, filler, and throat-clearing. It does not mean removing anything the recipient needs to respond or act. A message can be short and still fail if it omits the deadline, the decision owner, or the question that needs an answer. Cut the sentences that repeat earlier ones or add no action, and keep the sentences that carry the request.
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Concrete: give specific facts, dates, and owners
Concrete communication uses facts, data, and examples in place of general claims. Specific details are what turn a vague complaint into a task. Where a message depends on a date, a figure, a file, or a person, name it. The press note describes concrete communication in exactly these terms: facts, data, and examples.
Correct: check names, figures, and instructions before sending
Correctness means verifying facts and fixing errors before the message leaves your hands. Check names and spelling, figures and totals, attachment names, links, and the instructions you give. A wrong number in a message that is otherwise clear and courteous can cost more trust than a rough tone, because the recipient may act on it.
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Courtesy means a respectful, professional tone suited to the audience and the situation. It includes some empathy where the recipient is affected by a decision or a delay. Courtesy should not hide the request. A message that is so polite the recipient misses what you need has failed the clarity test, whatever its tone.
Two drafts compared
The following example is illustrative and was written for this article; it does not report a test or measured result. A manager needs a corrected expense report from a colleague.
Draft A: “Hi, the report is still not right. Please fix it and let me know.”
Draft B: “Hi Priya, the Q3 expense report has two problems: the travel totals in section 2 don’t match the receipts, and the Berlin hotel receipt is missing. Could you correct both and send the revised file by 3 p.m. Thursday? I’m presenting it to finance on Friday morning.”
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| Comparison point | Draft A | Draft B |
|---|---|---|
| Recipient understanding | Unclear: which problems, and what “right” means | Clear: two named problems and one requested action |
| Context to act | Missing: no location, no deadline, no reason | Included: location of each error, deadline, and reason for urgency |
| Specificity and ownership | Vague; the owner is implied rather than stated | Specific sections and receipts; the request is addressed to one named person |
| Accuracy | Cannot be checked by the recipient | Each claim can be checked against the file |
| Tone | Curt, with no acknowledgement | Direct and courteous without softening the request |
Draft A is shorter, but the recipient must write back to ask what is wrong, which costs more time than the sentences saved. Draft B is longer, yet every sentence serves an action. The trade-off is therefore not short versus long; it is whether each sentence helps the recipient respond.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Balancing the five tests
The five principles can pull against one another. These balancing points are editorial synthesis of the definitions in the sources above:
- Concision must keep action context. Removing a deadline to save a line is a false economy.
- Completeness must not bury the main point. Put the request or decision in the first two sentences, then add the detail.
- Concreteness depends on accuracy. A specific wrong figure is worse than an honest general statement.
- Courtesy must not obscure a necessary request or decision. A friendly opening should not replace the ask.
Applying the checks across channels
The Diversity Movement workplace guide applies the principles beyond formal email, to Slack, text, telephone, video chat, and in-person conversations. Its advice for written messages is to plan the message before writing, keep it direct, add a call to action, and check whether it answers who, what, when, where, why, and how. The same questions apply in other channels:
- Chat (Slack or text): put the ask in the first line and keep one topic per thread so the request is not lost.
- Telephone and video: restate the decision and its owner before ending the call, because the spoken exchange leaves no text to check.
- In person: confirm the outcome aloud, then send a short written recap for anything involving a deadline or a figure.
A pre-send checklist
- Clear: write your purpose in one sentence before drafting. If the first sentence does not state it, rewrite.
- Concise: delete any sentence that repeats an earlier one or does not help the recipient respond or act.
- Concrete: check for the who, what, when, where, why, and how. Add the missing owner, date, or file name.
- Correct: verify every name, figure, link, attachment, and instruction against the source document.
- Courteous: reread the message as the recipient would. Confirm the tone is respectful and the request is still plain.
What the evidence does and does not show
- The UBC-hosted course material is writing guidance from a university course. It does not report measured outcomes.
- The Petroleum and Natural Gas Regulatory Board press note is an official-sector announcement dated March 30, 2026. The wording of the five principles here follows its published summary; check the full document before quoting it directly.
- The Diversity Movement guide gives practical advice across channels. It does not report measured results.
- The Prezent article, updated July 30, 2026, is a secondary business source. It shows that the five-term list varies between publishers and does not set a standard.
None of these sources measures whether the checklist improves workplace results, and no named statistic linking it to performance was identified. Treat the 5 Cs as a set of practical checks that make messages easier to act on, not as a proven method for career outcomes.
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