MYP Science: The Scientific Method — FAQ

It's the repeatable process scientists use to test an idea: ask a question, form a hypothesis, design a fair test, collect data, then evaluate whether the evidence supports your hypothesis. In MYP 1-3, you'll practise this cycle in every practical, and it's directly assessed through Criteria B and C.

Question, hypothesis, variables, method, results, analysis, conclusion, evaluation — that's the order examiners expect to see in a lab write-up. Miss the hypothesis or skip identifying variables and you'll lose marks on Criterion B, even if your data is perfect.

A hypothesis is a testable prediction backed by scientific reasoning, not just a guess about the outcome. A strong MYP hypothesis names the independent and dependent variables and explains why you expect that relationship, using content from what you've already studied that term.

The independent variable is what you deliberately change; the dependent variable is what you measure as a result; controlled variables are everything else you keep constant so the test stays fair. Mixing these up is the single most common reason students lose marks on Criterion B design.

Top marks on Criterion B and C come from precision, not effort alone: a hypothesis with real scientific reasoning, variables clearly named and controlled, data presented in an appropriate table or graph, and an evaluation that names specific sources of error rather than saying "human error."

It's assessed mainly through Criterion B (Inquiring and Designing) and Criterion C (Processing and Evaluating), each scored out of 8, with descriptors that get more demanding at MYP 4-5. Criterion A (Knowing and Understanding) and Criterion D (Reflecting on Impacts) can also draw on your inquiry work.

The most common one I see: writing a method that describes what you did rather than one detailed enough for someone else to repeat it exactly. A close second is only changing one variable in name but accidentally letting a second one drift — which invalidates the whole test.

Redo past labs and rewrite just the hypothesis and evaluation sections stronger — that's where most marks are lost. Past MYP-style worksheets with structured inquiry questions, and Revision Notes that model full lab write-ups, are the fastest way to see what a top-band answer actually looks like.

Yes — the inquiry cycle (question, hypothesis, variables, method, analysis, evaluation) is identical across all three sciences in MYP 1-3, because Criteria A-D apply to the whole subject group, not to individual sciences. Only the content and apparatus change, not the process.

MYP inquiry write-ups are the direct groundwork for DP Internal Assessments, but they're shorter and more scaffolded — usually a structured worksheet or lab template rather than a full independent report. The habits (hypothesis, variables, evaluation) carry straight through to DP.

"Fair test" is teacher shorthand for controlling every variable except the one being deliberately changed — it's the core requirement examiners check under Criterion B. If your child's write-up doesn't name controlled variables, that's usually the first thing marked down.

You don't need a science background — just ask your child to talk you through their last lab: what was the question, what did they predict and why, what did they keep constant? Talking it through out loud exposes gaps in reasoning faster than rereading notes silently.

RevisionPrep's Topical Worksheets and Revision Notes for MYP Sciences cover the inquiry cycle stage by stage — hypothesis-writing, variable identification, data analysis and evaluation — with practice questions scaffolded to MYP achievement levels rather than generic science drills.