Picture a student using a screen reader in a statistics course. In book one, a scatter plot comes with the axes, the number of points and the overall spread. Book two has a nearly identical plot, and it’s just announced as “graph.” By book four, a figure that carries a whole chapter gets skipped because someone marked it decorative. Same student, different books, and nobody decided that.
A 2021 study audited 355 open textbooks against WCAG 2.1, and most failed basics like alt text for images. Those aren’t commercial series, but the cause is the same: quality depends on who writes it. Add new authors and vendors with every title and it multiplies.
So who writes the descriptions, and who sets the rules? That’s what alt text services are for.
Where Inconsistencies in Textbook Image Descriptions Come From
Honestly, nobody plans this. It just happens. Every writer has their own instincts. One person describes only the main subject, and the next throws in background detail that does nothing for the lesson. The terms drift too, so the same cell structure or landform ends up with a different name in every book.
Then there’s the detail problem. A diagram gets two sentences in one volume and a whole paragraph in another, even though it’s doing the exact same job in class. Charts, maps, photos and diagrams all need different things from a description, and they rarely get them. And every time a new contributor joins, they bring their own habits along.
That said, not every difference is a problem. Some variation is just the image asking for something different. The trick is telling apart the variation that hurts meaning or accessibility from the variation that makes sense.
How Alt Text Writing Services Help Publishers Audit Existing Descriptions
You can’t fix what you haven’t mapped, so start with an audit. Build one central inventory with each image’s asset ID, textbook title, edition, grade, subject, page location and current alt text. Then group images that do similar work, like recurring diagrams or comparable charts, and compare the terminology inside each group. Look at depth too. Two similar images shouldn’t be wildly different in length.
Next, sort every discrepancy into one of four piles: factual error, outdated wording, needless variation, or a difference the context actually justifies.
Start with anything that could mislead a student or leave out something essential. This is a good place to bring in an alt text writing service. They can work through the review methodically and give your editors a prioritized list to approve.
How a Shared Alt Text Style Guide Keeps Descriptions Consistent
A style guide keeps alt text consistent without making every description sound alike. Begin with purpose: alt text should carry what matters for the image’s role in the lesson, and skip the rest of what is visible.
Add terminology rules, meaning an approved list of subject terms that every volume uses the same way. Spell out what a photograph, a chart, a map and a diagram each need. Cover writing conventions such as sentence structure, punctuation, abbreviations and repetition.
Write down the exceptions so people know when variation is acceptable, and add examples: approved descriptions next to ones that are inconsistent or overloaded.
The guide’s job is to standardize how writers decide what to say. Images that communicate different things should still get different wording.
How Publishers Can Apply Corrections Across Multiple Books
Okay, so once you’ve got your standards, the rest is mostly logistics, and that part is less glamorous but it’s where things either stick or fall apart.
First, put together one shared terminology reference. Anything that keeps showing up across the books, like the same subjects, the same parts of a diagram, the same visual elements, goes in there so everyone calls it the same thing.
Then tie every revised description to an asset ID. Sounds boring, I know, but it’s how you make sure the new text lands on the right image in the right edition and doesn’t get pasted onto the wrong one. Give every team the same review checklist too. Authors, editors, designers, accessibility reviewers, all of them should be working from the same approved guidance, because if each group has its own version of the rules, you’re right back where you started.
Keep a change log as you go. Write down the original text, the new text, why you changed it, and whether it’s been approved. When someone asks six months later “why does this say that?”, you’ll have an answer.
And look twice at reused images. A description that works great in a grade 6 chapter might be way off for the same image in grade 9, because the student is using that picture for a different purpose.
If you’ve got a big batch of revisions, that’s where an alt text writing service really helps. They can handle the volume, and you still keep the final say on subject accuracy and approval.
Quality Checks That Prevent Inconsistencies From Returning
Clearing the backlog is one job. Keeping it clear is another. For every new batch, compare descriptions of similar images against the style guide, and check terminology, labels, values and relationships against the image itself.
Confirm that each description matches what the image is meant to teach. Meaningful images need text alternatives, and decorative ones should be marked so screen readers skip them.
Then test in the real digital format. Approved text sometimes gets stripped or overwritten during exports and content migration, and you want to catch that before students do.
Put alt text review on the production checklist for every new edition, and check consistency twice: inside each book and across the whole series. A description can pass local review and still clash with the terms used in another volume.
Conclusion
Inconsistent image descriptions confuse students, and they make accessibility harder for publishers to maintain across a whole series. The good news is you don’t need every description to sound the same. You need clear writing standards, terminology everyone sticks to, and a habit of checking that each description gives the right information for its image.
Run regular audits and quality checks, and you’ll catch the problems before the next edition goes into production.
That’s where QA Solvers comes in. Our alt text writing services help publishers review and revise image descriptions across multiple textbooks, so the whole series stays accurate, accessible and in sync.
