Investigating Science Scaling HSC 2026: Does It Scale Up or Down?

What Investigating Science actually asks of you

The HSC exam is one written paper worth 100 marks: 3 hours plus 5 minutes reading time, with NESA-approved calculators allowed. Section I has objective-response (multiple-choice) questions worth 20 marks (Questions 1-20; allow about 35 minutes). Section II is worth 80 marks: questions may contain parts, there are 20 to 25 items, and at least two items are worth 7 to 9 marks (allow about 2 hours and 25 minutes). The paper gives approximately equal weighting to Modules 5 to 8, and Working Scientifically skills are examined throughout, so expect to write methods, draw graphs, judge the validity of an investigation and analyse claims in stimulus. Every question is compulsory. In school-based assessment the mandatory Year 12 components are Skills in working scientifically (60%) and Knowledge and understanding of course content (40%), and 30 hours of the course are spent on depth studies.

The Investigating Science exam is Tuesday 3 November 2026, 1:55 pm (3 hours 5 minutes (5 minutes reading plus 3 hours working, 1:55 pm – 5:00 pm)). Source: HSC timetable.

The 4 areas of study you are examined on

From the NESA Investigating Science Stage 6 Syllabus (2017) — HSC 2026.

• Module 5: Scientific Investigations
  Module 5 asks why investigations begin and how they are judged. You study what prompted Marshall and Warren (peptic ulcers), Von Helmont (plant growth) and Spencer (microwaves) to investigate, the hypotheses they tested and where they departed from the tidy linear model of scientific method — Marshall famously experimented on himself. You evaluate the objectives, data and methodology of Eratosthenes, Doppler, Priestley and Marshall and Warren, and justify choosing experimental testing, fieldwork, surveys, information sources or modelling. Then you design your own investigation: variables and controls, sample size and selection, materials, ethics, time frame, and whether to work alone or collaboratively. The module ends with validity, reliability and the structure of a peer-reviewed report.
  In the exam: Expect to write a valid method for an unfamiliar hypothesis (5 marks in 2025), evaluate the validity of a described experiment, choose the right sample or graph type in Section I, and explain how a named scientist's methodology differed from the traditional model.
  Where marks go missing: Treating repetition as the same thing as reliability, or validity as the same as accuracy. Reliability is the consistency of results; validity is whether the test measured what it was meant to; accuracy is closeness to the true value.
• Module 6: Technologies
  Module 6 examines the two-way relationship between science and technology. Practically, you design investigations that measure both variables quantitatively — temperature and reaction rate, temperature and gas volume, speed and distance, pressure and gas volume — and evaluate the measuring devices: resolution, random and systematic error, calibration, and the accuracy of analogue against digital instruments. You assess safety with safety data sheets and Work Health and Safety guidelines. Conceptually, you trace the continuous cycle: X-ray diffraction revealing DNA's structure, radiation detectors and atomic theory, the Large Hadron Collider and the Higgs boson, and geological simulations; and in the other direction optics laws leading to microscopes and telescopes, radioactivity to radiotherapy and nuclear weapons, DNA to genetic modification, and Newton's laws to earthquake-resistant buildings. The module also covers scientists' growing respect for Aboriginal and Torres Strait Islander Peoples' knowledge of plants and ethical bioharvesting.
  In the exam: Data questions compare digital and analogue readings against a true value, classify random and systematic errors, and ask for a graph with a line of best fit. The final extended response is often on the science-technology cycle (8 marks in 2025, 7 marks in 2023).
  Where marks go missing: Saying a digital instrument is always more accurate. Accuracy depends on calibration; a miscalibrated digital probe gives precise but inaccurate readings, and recording more decimal places than the instrument's uncertainty is an error in itself.
• Module 7: Fact or Fallacy?
  Module 7 is about separating evidence from persuasion. You plan and run an investigation to test a claim, judging validity, reliability and accuracy and the effect of sample size and selection, and you compare emotive advertising with evidence-based claims on food packaging and products. You justify placebos, double-blind trials and control groups, and evaluate how societal and economic pressures can shape data on climate, health remedies and statistics. You analyse correlation mistaken for causation (the Hawthorne effect, the 1991 hormone replacement therapy study, the Mozart Effect), media reporting of a contemporary debate, the words theory, hypothesis, belief and law, conflicts of interest (tobacco, fossil fuels, asbestos, commercial research), the halo effect, and pseudosciences such as astrology, numerology and iridology. Finally you ask whether peer review can find the truth: fraud, publish or perish, cold fusion, hoax papers and fake journals.
  In the exam: Short explanations of named examples (the Mozart Effect, astrology, numerology, conflicts of interest) and stimulus-based analysis of a company's graphs or claim. Section I regularly tests the halo effect, emotive advertising and the abstract of a journal article.
  Where marks go missing: Naming a fallacy without linking it to the stimulus. Markers reward answers that point to specific features of the claim, graph or source and explain why they mislead.
• Module 8: Science and Society
  Module 8 looks at science in its social, ethical, economic and political setting. Case studies of nuclear meltdowns, the smallpox vaccine, the development of flight and the damming of rivers show how events change the public image of science. You investigate why research is regulated — embryo and sex-cell modification, biotechnological weapons, drug testing, the nuclear industry and Indigenous cultural and intellectual property — and evaluate international codes of conduct on cloning, stem cells, surrogacy, GM foods and organ transplantation. You weigh space exploration against spending on poverty and food supply, evaluate research that aided economic development (nuclear power, antimicrobials, GM foods, petroleum products, robotics and drones) and world health (surgical devices and procedures, water treatment, vaccination), and analyse how governments, corporations, research budgets, benefit-sharing and cultural perspectives steer research.
  In the exam: Evaluate and Discuss questions on a specific device, code of conduct or research example (4-7 marks), often with a graph or table — world death rates, government spending or dam impacts — to be referred to explicitly.
  Where marks go missing: Writing a general essay on 'science is good for society'. Name a specific device, code, event or program, give concrete effects, and make a clear judgement when the command word is Evaluate or Assess.

Full Investigating Science study-design guide →

How scaling works in New South Wales

In New South Wales, NESA reports an HSC mark for each course, but the ATAR is not built from those marks. UAC takes the raw examination and assessment marks and scales each course separately, so that a mark means the same thing no matter which course it came from. A course whose students perform strongly across everything else they study is scaled up; a course whose students perform less strongly elsewhere is scaled down. UAC then adds your best 10 units of scaled marks: the best two units of English, which are compulsory, plus the best eight remaining units. That aggregate is ranked statewide and reported as an ATAR. Scaled marks are usually lower than HSC marks, and the statewide average scaled mark is close to 25 out of 50.

What scaling is not

Scaling is not a difficulty rating and it is not a bonus. It compares how the students in one subject performed across every other subject they took, so a subject moves because of its cohort, not because of the paper. The consequence is practical: you cannot scale your way out of a weak result. The only lever you control is the raw mark, and the fastest way to move that is full-length timed practice against the real exam format.

Questions

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