MYP Physics: Reflecting on Physics in Society (Criterion D) FAQ

Criterion D asks you to explain how physics addresses a real problem, then evaluate the wider implications — social, economic, environmental or ethical — of that application. You need accurate scientific language and correctly documented sources. It's marked out of 8 in MYP Years 4-5, across four separate strands the IB calls i, ii, iii and iv.

Criterion D, 'Reflecting on the Impacts of Science', is one of four MYP Sciences assessment criteria used to award your physics grade. Where Criteria A-C test knowledge, inquiry design, and data processing, Criterion D tests judgement — can you connect a physics concept, like radioactivity or renewable energy, to its real-world consequences?

Criterion D has four strands: (i) explain how science is applied to a specific problem, (ii) discuss and evaluate the implications of that application, (iii) apply scientific language effectively, and (iv) document sources correctly. According to the MYP Sciences guide published by the International Baccalaureate, all four are assessed together against a single set of level descriptors, out of 8.

A 7-8 response explains the physics application in real depth, then genuinely evaluates the implications — arguing both benefits and drawbacks rather than just listing them — with a justified conclusion. Scientific language stays accurate throughout, and every source is fully, correctly documented. Vague claims like 'this helps the environment' without evidence cap you at level 5-6.

Expect three command terms: 'explain', 'discuss' and 'evaluate'. Explain wants reasoned cause-and-effect detail; discuss wants a balanced look at different viewpoints; evaluate wants a weighed judgement with a justified conclusion. In fifteen years of marking these, the single most common mark loss I see is writing a description when 'evaluate' was actually asked for.

Take a task on nuclear power. A strong answer explains nuclear fission and energy release in reactors, then evaluates implications — low-carbon electricity generation against radioactive waste storage, accident risk, and public perception — before citing at least two credible sources in one consistent referencing style. Balance and referencing separate a 7-8 from a 5-6.

Most teachers assess Criterion D through an extended piece of writing, a case study, the discussion section of a scientific report, or an oral or multimedia presentation on a real issue — nuclear energy, medical imaging, noise pollution. The exact task varies by school, but it always needs a genuine problem, not just a physics fact recited back.

Yes — strand iv marks you specifically on documenting the work of others and the sources you used. A top answer references consistently, in one recognised format such as APA or MLA, with every claim traceable to evidence. Missing citations, even in an otherwise strong response, caps your strand iv score at level 3-4 or lower.

Your MYP Physics grade (1-7) comes from adding your four criterion levels — A, B, C and D, each out of 8, for a total out of 32 — then converting that sum using your school's grade boundaries. A weak Criterion D can drag your final grade down even if your practical work in B and C is excellent.

Criterion D builds the evaluative habits the DP Physics internal assessment demands later — weighing real-world significance, discussing limitations, and referencing sources properly. MYP Criterion D looks outward at societal impact, while the DP IA looks inward at your own experimental method, but the underlying skill of honest, evidence-based evaluation transfers directly between the two.

The strands and the 0-8 maximum stay identical in MYP Years 4 and 5 — the structure of Criterion D doesn't change between the two years. What usually shifts is task complexity: an MYP 5 teacher expects a more sophisticated issue, deeper evaluation, and tighter referencing than a comparable MYP 4 task on the same criterion.

The most effective home revision is practising the evaluate skill on real issues — nuclear power, electric vehicles, medical imaging — rather than re-reading physics notes. Have your child write one paragraph explaining an application, then a second paragraph genuinely weighing its pros and cons before reaching a justified conclusion, with sources listed properly.

Yes — the best practice pairs a physics topic with a real issue and comes with mark schemes showing what separates a 5-6 response from a 7-8 one. Practising against genuine level descriptors, not just revising topic content, is what actually moves a Criterion D grade upward from one report to the next.