How Is MYP Science Assessed Against Criteria A–D?

MYP Science uses four criteria: A (Knowing and Understanding), B (Inquiring and Designing), C (Processing and Evaluating), D (Reflecting on Impacts of Science). Each is marked out of 8 using level descriptors in strands of three, and teachers must assess every criterion at least twice per year, per the MYP: From Principles into Practice guide.

Criterion A checks whether you can recall science facts, apply concepts to unfamiliar contexts, and analyse or interpret scientific information — usually through tests or structured questions. At the top band (7-8), you're expected to apply concepts to solve problems in both familiar and unfamiliar situations with real depth.

Criterion B assesses your ability to state a testable hypothesis, explain it scientifically, and design a method with controlled variables that's safe, ethical and logically sequenced. Top marks (7-8) need a method detailed enough for someone else to replicate your investigation exactly and get comparable results.

Criterion C looks at how you collect, organise, present and interpret data — plus how honestly you evaluate your method's validity. Higher bands require discussing the reliability of your conclusion, identifying specific weaknesses in your method, and suggesting realistic, detailed improvements rather than vague ones like "use more trials."

Criterion D asks you to evaluate how science and technology affect society and the environment, and to reflect on the implications of scientific developments using varied, correctly referenced sources. It's the criterion students most often underestimate — it rewards genuine ethical reasoning, not a one-line statement that "science can be good or bad."

Your teacher awards a level (0-8) for each criterion assessed across the year, then adds the four criterion totals for a score out of 32. That total is converted to a 1-7 grade using an IB-published grade boundary table, which your school's MYP coordinator applies at the end of each semester or year.

Because your overall grade isn't just Criterion A. If your tests are strong but your lab reports (Criterion B/C) or your reflective work (Criterion D) are weak or missing, those low or absent scores pull your total down. All four criteria carry equal weight in the final calculation.

IB requires each of the four criteria to be formally assessed at least twice across the year, though most schools assess more often — Criterion A especially, since it maps naturally onto regular testing. Your school's assessment policy (available from the MYP coordinator) sets the exact schedule for your year group.

Best-fit means your teacher looks at all evidence for a criterion across the year and picks the level descriptor your overall performance matches most closely — it's a professional judgement, not a mathematical average of every task. A strong final task can outweigh a weaker early one if it better reflects your current ability.

You need consistently high-band evidence across all four criteria, not just one. That means precise scientific language in tests (A), fully justified hypotheses and detailed methods (B), accurate data processing with a genuine evaluation of validity (C), and well-referenced, thoughtful impact discussions (D).

Most students lose Criterion D marks by describing an impact rather than evaluating it, or by citing only one source instead of several credible, varied ones. Top bands require you to discuss both the benefit and the risk of a development and reference where your evidence actually came from.

Write it as a numbered, replicable procedure: state quantities, equipment, and repeats, then name your independent, dependent and controlled variables clearly before the steps begin. A method scoring 7-8 needs enough precision that a classmate could follow it and get comparable results without asking you a single question.

Yes — Criteria A, B, C and D are identical across MYP 1 through 5; what changes is the complexity of tasks and the sophistication expected in your responses, not the criteria themselves. A Year 1 student and a Year 5 student are judged against the same four descriptors, just with rising demands.

MYP uses four criteria (A-D) scored out of 8 each, totalling a 1-7 grade with no external exam. DP Sciences instead combine internal assessment (a single investigation, worth roughly 20% depending on subject) with external written exams and specific assessment objectives — a real shift in structure your child will need preparing for.

Not officially — MYP grades aren't a formal IB prerequisite for DP subject selection — but schools commonly use consistent Criterion B/C performance to advise whether a student is ready for DP Sciences at Higher Level. A student weak on Criterion D (impacts) often struggles later with DP's Nature of Science elements too.