Y08W36PA - How Vaccines Work and Why Herd Immunity Matters

This week you wrote an informative report explaining how vaccines work and why herd immunity matters, written for Year 6 readers. Now you'll read another student's piece and judge how well they translate complex science into clear, accessible language without losing accuracy.

Part 1

The Assessor Scorecard for

Informative – Informative report

Informative writing about science works best when it translates complexity into clarity. The writer decides what to include, explains technical terms in plain language, and shows why the information matters to the reader.

Ideas & Content

Inclusion of what matters: immune response, herd immunity, vulnerable people. Exclusion of what doesn't: mRNA history, specific disease percentages. Technical terms explained in plain language or avoided entirely.

  • Selection: including what matters for understanding, excluding what doesn't.

Structure & Cohesion

Movement from simple ideas to more complex ones. Movement from process (how vaccines work) to purpose (why it matters). Three-paragraph shape that introduces, explains, then connects.

  • Logical progression: simple to complex, process to purpose.

Audience & Purpose

Writing pitched to Year 6 readers meeting the topic for the first time. Accessible language and concrete examples they can picture. A clear sense of why this information matters to them.

  • Accessibility: language and examples suited to Year 6.

Language Choices

Precise but simple language: “disease germs” not “pathogenic microorganisms.” Active, clear verbs that show what's happening in the body. No unnecessary jargon that blocks understanding.

  • Clear language: precise but simple, no unnecessary jargon.

Conventions

Accurate information, especially when explaining scientific concepts. Error-free punctuation, spelling and grammar throughout. Conventions that support the writer's credibility on the topic.

  • Accuracy: correct information, error-free conventions.

Part 2

Today’s Marking Targets

Task in one sentence

Assess an informative report explaining how vaccines work and why herd immunity matters, written in the student's own words for Year 6 readers across three paragraphs.

Let’s Focus

Three strands matter most this week: Ideas & Content, Structure & Cohesion and Audience & Purpose. Ideas decides whether the science is accurate and selected well. Structure decides whether the explanation builds in a clear order. Audience & Purpose decides whether a Year 6 reader can understand the report without being overwhelmed.

Ideas & Content

Strong writing this week shows careful selection. The writer includes key concepts — how vaccines trigger immunity, what herd immunity is, why it protects vulnerable people — and leaves out details that don't serve the purpose. Technical terms are explained in simple language for Year 6 readers.

What markers scan for

  • Inclusion of key concepts about how vaccines and herd immunity work.
  • Clear explanation of antibodies and the immune response.
  • Evidence the information is in the writer's own words.
  • Technical terms explained simply for a Year 6 audience.

Score Bands

  • Basic

    Includes some correct information, but selection is unclear; key concepts may be missed and technical terms left unexplained.

  • Strong

    Includes key concepts about vaccines and herd immunity, explains most technical terms, and writes in the student's own words.

  • Excellent

    Smart selection of key concepts, technical terms explained clearly, examples that help Year 6 readers genuinely understand the science.

Structure & Cohesion

Strong writing this week follows a clear explanatory order: how vaccines prepare the immune system, what herd immunity means and why it matters for a community. Cause-and-effect links need to be explicit so the reader understands how one idea leads to the next.

What markers scan for

  • A logical three-part structure: vaccines, herd immunity and community impact.
  • Topic sentences that guide the reader through each paragraph.
  • Cause-and-effect links between immunity, infection and protection.
  • A conclusion that reinforces why the concept matters.

Score Bands

  • Basic

    The report includes relevant information but the order is unclear or cause-and-effect links are weak.

  • Strong

    The explanation follows a clear order and uses paragraphing and transitions to build understanding.

  • Excellent

    The structure is highly effective; each paragraph builds naturally and makes the science easier to follow.

Audience & Purpose

Strong writing this week is shaped for Year 6 readers. The writer should define terms such as vaccine, antibody and herd immunity in simple, accurate language. The tone should be clear and reassuring without talking down to the audience or adding unnecessary technical detail.

What markers scan for

  • Definitions written in language a Year 6 reader can understand.
  • Examples or comparisons that clarify the science.
  • A tone that is informative and respectful.
  • Careful selection of detail so the reader is informed, not overwhelmed.

Score Bands

  • Basic

    Shows some awareness of the Year 6 audience, but terms may be too technical or explanations too thin.

  • Strong

    Explains the topic clearly for Year 6 readers, defining most key terms and using an appropriate tone.

  • Excellent

    Audience awareness is excellent; complex ideas are made clear, accurate and respectful for younger readers.

Now read · Student sample

How Vaccines Work and Why Herd Immunity Matters

Year 8 sample · \~250 words

Student sample for assessment

Written by a Year 8 student in Footscray, Victoria, Australia.

A vaccine is medicine that helps your body fight off disease. When you get a vaccine, you're not actually getting the full disease. Instead, you're getting a very weak version of the germ that causes the disease, or sometimes just a small piece of it. Your body's immune system sees this weak germ and learns how to fight it. Your immune system makes special proteins called antibodies that learn to recognise that germ. If you ever meet the real, dangerous version of that germ, your immune system already knows how to fight it quickly. That's why vaccinated people usually don't get sick from diseases that unvaccinated people catch. But vaccines don't protect just the person who gets vaccinated. They help protect people around them too. Herd immunity happens when enough people in a community are vaccinated. If most people are immune, the disease germ can't spread from person to person anymore. It runs out of people to infect. This matters because some people can't get vaccinated—babies too young for certain vaccines, or people with medical conditions that make vaccines unsafe for them. These vulnerable people depend on everyone else being vaccinated to keep them safe. If enough people get vaccinated, the disease simply can't reach them. Getting vaccinated is one of the most important health choices you can make. It protects you from serious illness. And it protects people around you, including people you might never meet. That's why doctors and scientists push vaccination so hard. It's not just about individual protection—it's about community protection. When enough of us do our part by getting vaccinated, we all stay healthier.