Three things separate Higher Level from Standard Level in the new IB Psychology course. You study three HL extensions. You sit a fourth component, Paper 3. And your internal assessment counts for less of your final grade than it would at SL.
Everything else is shared. Same six concepts, same content, same four contexts, same Paper 1, same Paper 2, same class practicals, same IA task.
That is a smaller list than most people expect, and it changes where your effort should go depending on which level you are taking.
What is identical at both levels
Paper 1 is 1 hour 30 minutes and 35 marks at SL and HL. Same three sections, same mark split.
Paper 2 is 1 hour 30 minutes and 35 marks at SL and HL. Same four Section A questions on your class practicals, same unseen study in Section B.
The internal assessment is the same task. A research proposal, 2,200 words maximum, 24 marks across four criteria, roughly twenty hours of class time. You design a study using one of the four research methods from your class practicals. You do not run it.
The six concepts run through both levels in exactly the same way.
So if you are wondering whether HL means a different course with extra topics bolted on, it does not. It means the same course plus one more layer.
The HL extensions: culture, motivation and technology
At HL you study three extensions: the role of culture in shaping behaviour, the role of motivation in shaping behaviour, and the role of technology in shaping behaviour.
These are not free-standing topics. Each one sits inside the four contexts you already know, with its own areas of inquiry named in the syllabus tables. So culture in human development is not the same material as culture in health and well-being, and the exam can draw on either.
The point of studying them is different from the rest of the course, and this catches people out. You are never asked to reproduce a study from memory in Paper 3. The sources are in front of you.
What the background knowledge does is let you recognise what an unfamiliar source is doing, name the mechanism it is testing, and identify what it cannot establish. If you can explain what a study showed, how it showed it and what it does not license, you have what the exam needs.
That means your HL revision is not a memorisation task. It is closer to building a set of mechanisms and moderators you can recognise on sight.
Paper 3, the component only HL sits
Paper 3 is 1 hour 45 minutes, 30 marks, and 30% of your HL grade. You get a resource booklet you have never seen, containing several sources drawn from one extension inside one context. A mix of quantitative and qualitative, experimental and non-experimental. The data may be real or written for the exam.
| Question | Marks | What it asks | Approximate time |
|---|---|---|---|
| 1 | 3 | Explain one issue that limits what can be read from the data in a named source | 10 min |
| 2 | 6 | Analyse the findings from a named source and state a conclusion linked to the claim | 35 min for Q2 and Q3 together |
| 3 | 6 | Discuss credibility, bias, or how far findings transfer | |
| 4 | 15 | Judge how far a stated claim holds, using at least three sources and your own understanding of the extension | 55 min |
Question 4 is worth as much as the other three combined, which is why it gets more than half your time.
It is also judged on three things at once, and all three have to be visible on the page.
Your own understanding of the HL extension, used to interpret the evidence and to say how far the claim holds. Critical analysis of at least three sources, argued from their design, measures and samples. And evaluation of competing points of view, ending in a conclusion that actually follows from what you argued.
Watch the first of those. Your extension knowledge is assessed in its own right. An answer that analyses the sources beautifully but shows no background psychology cannot reach the top band. The reverse is also true. And an answer that does both without ever weighing a rival reading of the evidence, or without a conclusion that matches its own argument, stalls short of the top for a different reason.
Your IA is worth more at SL
This is the difference that changes how you should plan your two years.
| SL | HL | |
|---|---|---|
| Internal assessment | 30% | 20% |
| External exams | 70% | 80% |
At SL, your internal assessment is close to a third of your final grade. It is also the only component where you have weeks rather than ninety minutes, plus your notes, your teacher, and the published mark scheme.
Compare that to Paper 1, where you get an hour and a half and whatever is in your head that morning. If you are at SL and deciding where to invest effort early, the IA is the clearest answer in the whole course.
At HL the IA still matters, but you are carrying an extra 30% of externally assessed marks in Paper 3, and that paper cannot be prepared the way the IA can.
The part SL studies but is not assessed on
Data analysis and interpretation is studied at both levels. It is only formally assessed at HL, through Paper 3. No Paper 2 question at either level asks you to calculate or formally interpret statistics.
So why learn it at SL?
Because Paper 2 Section B hands you an unseen study, and being able to read whatever that study reports is what makes your evaluation specific rather than generic. An unseen study may give you descriptive statistics, an association, or qualitative findings with no numbers at all. Reading accurately what it does report is what lets you point at the study in front of you rather than at studies in general.
It is not assessed directly. It still shows up in your marks.
What this means for how you revise
If you are SL, your two highest-value investments are the IA and Paper 2 Section A. The IA because of its weighting and because you control the conditions. Section A because it is 20 of Paper 2's 35 marks, the four question types are stable, and it depends entirely on records you can only write properly while each class practical is fresh.
If you are HL, add one more habit. Build background knowledge on the three extensions as mechanisms rather than as studies to recite, and practise reading unfamiliar sources under time pressure. Paper 3 is the only paper where you cannot prepare the content in advance, which is exactly why the preparation you can do matters so much.
Both levels share the same core need. Learn to use the six concepts as questions rather than definitions, because that skill is what Paper 1 Section C, Paper 2 Section B and Paper 3 Question 4 are all measuring in different ways.
If you want a starting set of materials for either level, the PsychExcel Starter Library is free and covers the essentials for the concepts, the papers and the IA.