Diagnostic assessment for personalized learning

Diagnostic, formative and summative assessment: what changes?

The distinction is the decision the assessment supports. A diagnostic check asks what the learner brings to a topic and what may need attention first. Formative assessment guides changes during teaching. Summative assessment records achievement at the end of a unit or course. The same question can serve different purposes depending on when and how its answer is used.

For example, a fractions question before a ratio unit can reveal a prerequisite gap. During the unit it can guide the next explanation. At the end it may contribute to a grade. A diagnostic result should lead to support, rather than becoming a permanent label about a learner’s ability.

The Education Endowment Foundation’s mastery learning guidance includes diagnostic assessment, sequencing, feedback and additional support as connected parts of implementation. It also describes limited evidence and variation in outcomes. Buying an assessment tool alone does not implement that approach.

Build a short diagnostic around a prerequisite

Imagine the next lesson involves comparing ratios, but students need secure fraction concepts first. Choose questions that separate specific ideas. The following examples are a starting point for teacher review, not a standardized assessment.

A wrong response suggests a follow-up; it does not prove its cause. A student who selects 1/5 may have read too quickly. Someone who answers correctly may have guessed. Ask for a brief explanation or a second example before assigning substantial remedial work.

Keep the language simple and accept appropriate equivalent forms. Decide in advance whether simplification is required. If a check is about fraction meaning, rejecting 2/4 solely because it is not written as 1/2 can obscure the skill you intended to assess.

Turn evidence into a personalized learning plan

Write the next action at the concept level. “Work on fractions” is too broad. “Compare unit fractions using equal-sized wholes, then explain a new pair without the diagram” tells a tutor what to do and gives the teacher a way to check progress.

Students who demonstrate the prerequisite can move to an application task. Students with different gaps should receive different short activities. Avoid sending everyone below a total-score threshold through the same full chapter: identical totals can hide very different needs.

Keep groups flexible. A learner may need support with a representation while reasoning confidently in another context. Record what was observed and when it was checked, rather than treating the group assignment as a stable description of the student.

Where an AI tutor can help with follow-up

An AI tutor can provide practice on an educator-selected concept, ask for an explanation and offer a prepared hint. The useful handover includes the objective, the learner’s response, the relevant misconception and the criterion for trying a new question. A chapter title and a percentage score give much less guidance.

Check whether your chosen platform actually supports the diagnostic-to-lesson workflow you need. If results must be reviewed and assignments made manually, include that work in the rollout plan. Do not assume automatic placement, assessment import or timetable changes are available because a tool uses AI.

Use checks during the lesson to update the initial diagnosis. If a learner succeeds only after several hints, preserve that distinction in the teaching notes. Independent success and supported success call for different next steps.

Review the diagnostic as well as the learner

If many students miss an item, examine the wording, diagram and accepted answer before concluding that the whole class lacks the concept. Ask a colleague to solve the questions and explain what each one measures. Review whether reading demands or unfamiliar notation are interfering with the intended skill.

After follow-up teaching, use new questions on the same concepts. Track which gaps were resolved, which require another approach and how much staff time the process takes. The result should be a manageable teaching decision for each learner, not a longer dashboard that nobody acts on.