How to compare a student's writing to their earlier work
Comparing a new piece with a student's earlier writing is the oldest authorship check teachers have. It's also easy to do badly from memory. Here's how to do it side by side, what to look at, and how to tell growth from a mismatch.
Pick the right samples
- Use writing you trust: in-class pieces, timed writing, short responses written in front of you.
- Match the kind of writing when you can. Compare an argument essay with argument essays and a narrative with narratives; genre changes how anyone writes.
- Use two or three pieces, not one. A single sample can be an off day.
- Keep length in mind. A paragraph carries much less information than a full page.
What stays steady in a writer
Vocabulary changes fastest; writers pick up new words all the time. The habits that change slowest are the ones writers don't notice:
- How often they use small words like "the," "and," "but," "of," and "so"
- How long their sentences run, and how much that length varies
- How they join ideas: commas, "and then," semicolons, or short separate sentences
- Punctuation habits, including the mistakes they make every time
- How their paragraphs start and end
What growth looks like
Real growth is usually uneven. A student who has learned to use transitions still writes sentences about their usual length and keeps most of their punctuation habits. Growth tends to show up in one or two areas at a time, and it shows up in their in-class work too.
What a mismatch looks like
A piece worth a closer look usually changes many of these at once: sentence length and rhythm, word habits, punctuation, and voice, all on one assignment, with none of it showing up in class.
Do it side by side, not from memory
- Open the new piece next to one in-class piece.
- Read one paragraph of each aloud. Differences in rhythm are easier to hear than to see.
- Count a few things in one paragraph of each: words per sentence, commas per sentence, and how sentences begin.
- Write the differences down in a sentence or two. "Sentences average 9 words in class and 24 here" is something you can discuss; "it feels off" isn't.
Where Authentext fits
Doing this by hand works for one essay. It doesn't scale to a class set. Authentext builds a Voice Profile for each student from writing you trust and compares every new submission against it, measuring sentence structure, small-word habits, punctuation, and vocabulary together. It shows which pieces depart from the student's own pattern and how, so you know where to spend your reading time. It reads finished work from Google Classroom and installs nothing on student devices.
Limits worth knowing
Comparison needs enough trusted writing, and short pieces carry less signal. A real draft lightly polished with AI can stay close to the student's pattern. A difference is a reason to look closer and talk with the student, not a conclusion.
Keep reading
Try Authentext during the beta
Authentext is in beta. It compares each student's writing to their own history, not to AI models.