HSC Investigating Science: complete 2026 guide to Modules 5-8 and the exam

HSC Investigating Science is the methodology-focused 2-unit HSC science. It does not teach a single discipline like Biology, Chemistry or Physics. Instead, it teaches the scientific method through case studies, with a heavy focus on how scientific claims are produced, communicated and evaluated.

This page is the index. Below you find a topic-by-topic breakdown, the exam structure, scaling notes, and the case-study Australian content that defines the course.

What makes Investigating Science different

Investigating Science is structured around four modules that build on each other. Each module is anchored by inquiry questions, and the content is taught through worked case studies rather than canonical facts.

Module 5: Scientific Investigations

How to design, run and analyse a scientific investigation. Hypothesis formation, variables, reliability, validity, accuracy, primary and secondary data, risk assessment, ethics, peer review, reproducibility. Roughly 25% of exam.

Module 6: Technologies

Case studies of how technology and science co-develop. The course rewards Australian examples: CSIRO Wi-Fi, the cochlear implant, the HPV vaccine, the OPAL research reactor, polymer banknotes, and the Royal Flying Doctor Service radio. Roughly 25% of exam.

Module 7: Fact or Fallacy

Distinguishing science from pseudoscience. Evaluating evidence quality, identifying logical fallacies, recognising cognitive bias, separating correlation from causation, and case-studying examples like Andrew Wakefield's retracted MMR paper, homeopathy, astrology and climate denial. Roughly 25% of exam.

Module 8: Science and Society

Ethics, regulation, communication and policy. NHMRC research ethics, evidence-based policy in Australia (plain packaging, COVID-19 response), the role of CSIRO and the BOM, IPCC and climate science, Indigenous knowledge alongside Western science, conflict of interest in funded research. Roughly 25% of exam.

Exam structure

Per the NESA HSC examination specifications, HSC Investigating Science is a single paper of 3 hours working time plus 5 minutes reading time, total 100 marks.

• Section I: Objective response (20 marks)
• Section II: Short answer and extended response (80 marks; 20 to 25 items, at least two worth 7 to 9 marks)

Longer items may ask for an evaluation: students are given a scenario or claim and asked to evaluate the science, the evidence, and the social or ethical implications.

How Investigating Science scales (2026)

In UAC's Report on the Scaling of the 2025 NSW HSC, Investigating Science had a scaled mean of 20.5 per unit out of 50. For comparison, from the same report:

• Chemistry: 32.0 per unit
• Physics: 31.0 per unit
• Biology: 26.2 per unit
• Investigating Science: 20.5 per unit

UAC warns that its tables are not a conversion from HSC marks to scaled marks, and scaling is recalculated every year; see how HSC subjects are scaled.

Investigating Science scales lower than the discipline sciences because the cohort is broader and the content is less mathematically demanding. The right reason to choose Investigating Science is interest in scientific method and Australian case studies, plus strategic ATAR planning where it can complement your strongest subjects.

Try the HSC ATAR calculator to test how Investigating Science fits into your subject mix.

The Australian case-study content

Investigating Science is the most Australia-focused HSC science. The course rewards specific named examples and penalises generic answers. The case studies you must know cold:

• CSIRO Wi-Fi (1992 to 2012). The fast-Fourier-transform indoor wireless patent and the patent enforcement that returned over a billion dollars to Australian research.
• Cochlear implant (Graeme Clark, 1978 onwards). Multi-channel implant developed at the University of Melbourne, now the global market leader.
• HPV vaccine (Ian Frazer and Jian Zhou, 1991 to 2006). Gardasil developed at the University of Queensland, the basis of the National Immunisation Program HPV schedule.
• Andrew Wakefield's 1998 Lancet paper. Retracted in 2010 after revealed undisclosed conflicts of interest and data fabrication, the canonical Module 7 case study.
• The IPCC and Australian climate science. BOM and CSIRO contributions to the Sixth Assessment Report.
• NHMRC and research ethics. Australia's National Statement on Ethical Conduct in Human Research.

Build a one-page summary per case study with the science, the people, the timeline, the evidence, and the social impact.

Study strategy

Investigating Science rewards systematic case-study mastery and explicit use of the scientific method vocabulary.

1. Build a case-study deck. One page each for 15 to 20 named case studies across Modules 6, 7 and 8. Include who, when, what evidence, what impact and what controversy.
2. Master the methodology vocabulary. Independent variable, dependent variable, controlled variable, accuracy, precision, reliability, validity, primary data, secondary data, peer review, replication, falsifiability. Markers test these definitions every year.
3. Drill the evaluation verbs. "Evaluate" requires a judgement. "Assess" requires weighing strengths and limitations. "Justify" requires evidence-backed reasoning.
4. Practise distinguishing claims. Pseudoscience versus science, correlation versus causation, opinion versus evidence. Use real examples (homeopathy, anti-vax, climate denial) so the marker sees you can apply the framework.

Our 2026 HSC Investigating Science syllabus coverage

Every Module 5 to 8 dot point we have shipped has its own focused answer page with worked past exam questions and cross-links to related points.

Browse the full set at /hsc/investigating-science/syllabus.

Module deep-dive guides and practice:

• Module 5 Scientific Investigations deep-dive - hypotheses, variables, reliability, validity, accuracy, precision, error and depth-study design.
• Module 7 Fact or Fallacy deep-dive - science versus pseudoscience, falsifiability, correlation versus causation and the hierarchy of evidence.
• Investigating Science practice questions (Modules 5-8) - exam-style questions with worked solutions across all four modules.

System context

HSC Investigating Science sits inside the wider HSC system. Related explainers:

• How the HSC ATAR is calculated - UAC's aggregate and scaling.
• How HSC subjects are scaled - why Investigating Science scales below the discipline sciences.
• Choosing HSC subjects for ATAR - when Investigating Science is a smart fifth subject.

For the official syllabus

NESA publishes the full Investigating Science Stage 6 syllabus, prescribed depth-of-study options and past papers at educationstandards.nsw.edu.au. The current syllabus has been stable since 2018.