How to review technical documentation changes

A small edit to technical documentation can change more than the wording. A swapped unit, missing “not,” or outdated command can make a procedure misleading or unsafe.

Compare the proposed revision with the approved version before you sign off. The Text Compare tool highlights text that was added or removed, giving you a focused list of changes to verify.

Review the documentation changes

1. Open Text Compare and put the approved text in one side and the proposed revision in the other. Keep the versions in the same order each time you review related sections.
2. Use a matching scope for both versions. Compare the same heading or complete section, not a paragraph from one version against an entire chapter from the other.
3. Read the differences from beginning to end. Check each addition and removal in context, including the sentence before and after it. A change that looks harmless on its own can alter a condition or exception nearby.
4. Make a separate pass for technical details: values, units, part numbers, command options, version numbers, links, warnings, and words such as “only,” “must,” and “never.”

Keep the source files unchanged while reviewing. If you need to prepare text for comparison, work from copies so you can return to the approved source and confirm the proposed revision later.

What the differences mean

New text appears

An addition may clarify a step, introduce a new requirement, or add an unsupported claim. Check whether it belongs in this section and whether it agrees with the product behavior, interface, or specification it describes. A new warning should say what can happen and what action prevents it.

Text has been removed

Deleted text can remove repetition, but it can also remove a prerequisite, limitation, or safety note. Look for a condition that the remaining instructions now assume. For example, deleting “after the device is disconnected” may turn a safe service step into an unsafe one.

A number, unit, or identifier changed

Treat every changed number as a fact to verify, not a copyedit. Confirm whether 5 ms became 5 s, whether a decimal point moved, or whether a model number changed by one character. Check values against the current product specification or test record, and keep the unit beside the value.

A large block appears to change

Many differences in a long section can mean the section was rewritten, moved, or compared against the wrong passage. Verify that the two inputs cover the same material and that headings have not shifted. Review the section in smaller, matching parts if a broad comparison is difficult to follow.

No difference appears

This means the text supplied to the comparison looks the same to the tool. It does not prove the document is correct or that the files have identical formatting, diagrams, or layout. Make sure you copied the intended revisions and inspect visual elements separately.

Resolve findings before approval

1. Check high-risk changes first. Review safety warnings, required steps, limits, and words that change permission or obligation. Ask the subject-matter owner to confirm any change that could affect equipment, data, or user safety.
2. Verify every changed technical value. Compare quantities, units, ranges, model identifiers, software versions, and command examples with an authoritative source. Do not infer that a new number is right because it appears in a polished revision.
3. Run changed commands or procedures in a safe test setup. Check that commands still use valid options and that steps work in the stated environment. Never test an uncertain instruction on production equipment or real user data.
4. Check links and references. Open changed URLs and confirm that cited sections, figure numbers, and cross-references still point to the intended material. A valid link can still lead to the wrong version or an outdated procedure.
5. Ask a second reviewer about ambiguous changes. Share the old and new wording plus the source used to verify it. Resolve disagreements with the document owner rather than silently choosing one interpretation.
6. Review the final rendered document. After corrections, check headings, code blocks, lists, tables, symbols, and page breaks in the format readers will use. A text comparison cannot show whether a table became hard to read or a warning moved away from the step it applies to.

What a text comparison cannot approve

A difference tool identifies changes in the text you provide. It cannot determine whether a changed instruction is technically accurate, whether a warning meets your organization’s requirements, or whether a diagram matches the written steps. It may also show a large block of changes when content was reorganized, even if some sentences remain the same.

Use the comparison as a review aid, not as the approval itself. For a release, record which source version you compared, who checked the technical claims, and which remaining questions need an owner. That makes it easier to explain what changed and why later.