Four editorial stages, what each one checks, what it deliberately leaves alone, and why running them out of order costs money.
Outside publishing, “proofreading” covers any kind of checking. Inside a publishing schedule it names one specific job at the very end. We think mixing the stages up is the most common way a book ends up paying for the same fix twice.
Here’s what each stage does, what it deliberately leaves alone, and where it sits in the schedule. The definitions draw on the two main professional bodies: the CIEP in the UK and the Editorial Freelancers Association (EFA) in the US.
The four stages at a glance
| Stage | Works on | Looks at | Leaves alone |
|---|---|---|---|
| Developmental editing | The whole draft | Content, structure, plot and genre fit | Sentence-level polish |
| Line editing | Sentences and paragraphs | Language and style, while correcting errors | Layout and the final typo hunt |
| Copyediting | The edited draft, before layout | Spelling, grammar, punctuation, consistency, house style, flow and tone; marking up structure; querying facts | Substantial rewriting and content planning |
| Proofreading | The proof: edited text in final layout | Essential errors, consistent page elements, style decisions applied, figures placed and numbered, corrections carried out | Rephrasing for flow, restructuring, new text |
Summarised from the CIEP’s Proofreading or copyediting? fact sheet and the EFA’s editorial service definitions.
Developmental editing
Developmental editors, also called substantive, structural or content editors, “deal with content, organization, and genre considerations”, in the EFA’s words. The output is often a letter rather than marked-up text: an editorial letter setting out the big-picture problems and how to fix them, or a manuscript evaluation, a written critique of the whole book.
This is the stage for questions like: does the middle sag, is the viewpoint working, does the book deliver on its genre’s promise? Fixing a typo here is wasted effort, because whole chapters may still move or disappear.
For publishers, a related question often comes even earlier, at acquisition: is this manuscript worth the investment at all? That’s the job of a manuscript assessment, which looks at commercial potential and positioning as well as editorial strengths and weaknesses.
Line editing
The EFA describes line editors as working “at the sentence or paragraph level”. Like copyeditors, they correct errors, but “their main focus is on improving the language and style of the text”. That means rhythm, word choice, clunky constructions and repetition: the difference between a sentence that’s correct and one that reads well.
The CIEP doesn’t list it as a separate stage. In its description, making “changes for flow, tone and intended readership” is part of copyediting, and the institute describes three main editorial stages, not four. The EFA notes that line editing may be sold as a separate service, or combined with developmental editing or with copyediting. When you commission either, say which one you mean.
Copyediting
The CIEP defines copyediting as work that “focuses on the detail of a text: checking grammar, spelling and punctuation; applying consistency to the language and formatting; and making sure it’s clear and reads well for its intended purpose.”
In practice that means applying house style, so that spellings, capitals, dates, numbers and units are consistent from the first page to the last. The CIEP’s fact sheet adds some jobs people forget: marking up headings, boxed text, quotes and tables for the designer, listing anything that needs permission to use, querying obvious factual inaccuracies and flagging potential legal issues.
The EFA adds a job that matters a great deal later on: preparing the style sheet that records every decision made, so that everyone downstream applies the same choices.
What copyediting isn’t, per the CIEP: substantial rewriting, planning the content, doing substantial research or fact-checking, or solving legal issues. It flags them and hands them back.
Spelling varies too. The CIEP and the EFA both write “copyediting”. You’ll also see “copy-editing” and “copy editing”. All three mean the same thing, so pick one for your house style.
Proofreading
In the CIEP’s words, proofreading “is the final quality check before publication, but after editing and layout.” The proof is the laid-out draft of the book. The EFA adds that in traditional publishing the proofreader compares the latest stage with the previous one, “making sure all changes have been made correctly.”
According to the CIEP, a proofreader checks for essential errors in spelling, grammar and punctuation. They make minor changes for sense, check that page elements are consistent and correctly placed, confirm that style decisions have been applied, and check that tables and illustrations are numbered and placed correctly.
Just as important is what a proofreader shouldn’t do: work on raw text, change spelling preferences, rephrase to make something sound better, reorder the structure or add new text. The CIEP puts it memorably:
“Copyediting and proofreading are both editing, which is wrestling with words; but proofreading is like wrestling in a broom cupboard.”
Gerard M-F Hill, quoted in the CIEP fact sheet Proofreading or copyediting?
Why the order matters
Each stage assumes the one before it’s finished. Structural edits make line edits obsolete, and line edits can undo a copyedit’s consistency. A copyedit that leaves real work for the proof stage means corrections have to be squeezed into typeset pages. Adding a sentence at proof can push text onto the next page, and a moved page can break an index, a contents page or a run of widows and orphans.
The practical rule: solve each kind of problem at the earliest stage that can see it. Structure at development, style at the line edit, consistency and house style at the copyedit, and at proof only what couldn’t have been caught before layout.
Budgets follow the same logic. The CIEP notes that copyediting usually takes longer than proofreading and costs more, which tempts some to skip it and “just get a proofread”. That usually moves the cost rather than saving it, because copyedit-level problems found at proof are more expensive to fix.
Where automated checks fit
Software doesn’t replace any of these stages, but it can make each human pass more focused. Luman Proofreading checks a manuscript for consistency, repetition, punctuation, style and house-style issues, calibrated to your own house style. It returns a structured report with a track-changes view and a per-category summary. Your editors accept, amend or ignore each flag. Luman flags; editors decide.
Publishers use it at four points in the schedule:
- Before acquisition, to spot quality and consistency issues that affect the offer.
- Pre-typesetting: a final editorial pass before the file reaches layout, where issues cost the most to fix afterwards.
- Pre-translation: clean the source first, or every error travels into every language.
- When backlist files are republished and need bringing up to the current house standard.
The pre-typesetting check is the one that follows most directly from this article. Catching a spelling drift or a mid-book change of name before layout is exactly the kind of fix that belongs at the copyedit, not the proof.
Briefing each stage
Most stage mix-ups start with a vague brief. Before any editor starts, tell them:
- Which stage this is, in those words, and what the previous stage covered.
- What they shouldn’t touch. For a proofreader, say explicitly: no rephrasing.
- The house style, plus the title’s style sheet if a copyeditor has already built one.
- The format they’ll work in: tracked changes in a Word file, or marked-up PDF proofs.
- Who answers queries, and how fast.
Questions publishers ask
Do I need both copyediting and proofreading?
The CIEP’s answer is yes: “If you’ve copyedited a document, it’s much easier to then skip over the sort of mistakes that a proofreader would pick up. One pair of eyes is not enough.” The two stages also look at different things. Only the proofreader sees the text as laid out.
What’s the difference between line editing and copy editing?
Both correct errors. Line editing concentrates on improving the language and style of each sentence and paragraph. Copyediting concentrates on correctness and consistency: spelling, grammar, punctuation, house style, and the style sheet that keeps every later stage consistent.
Is proofreading the same as editing?
Proofreading is one kind of editing, the last one. It checks the edited text after layout rather than improving the writing, so it shouldn’t be used to fix problems that belong to earlier stages.
Where does a manuscript evaluation fit?
At the start. The EFA lists a manuscript evaluation, an overall critique of the content, as one of the forms developmental editing can take. Publishers often need an assessment even earlier, to decide whether to acquire a book at all.
Can software replace a proofreader?
No. Automated checks are good at finding consistency, repetition and punctuation issues across a long manuscript quickly. Deciding which flags matter, and what the text should say, stays with your editors.
Sources
- CIEP, About proofreading and editing, 11 January 2024.
- CIEP, Proofreading or copyediting? fact sheet (PDF), revised August 2021.
- CIEP, What is the difference between copyediting and proofreading?, 11 January 2024.
- Editorial Freelancers Association, Editorial Service Definitions, accessed September 2026.
- Luman Technology, Luman Proofreading, accessed September 2026.
