Year 6 Science: Every Australian Curriculum Code, Explained

Year 6 Science in the Australian Curriculum is twelve content descriptions, and eight of them are Year 5 repeated. All six inquiry codes and both human endeavour codes carry over, seven of them character for character, and AC9S6I02 differs from AC9S5I02 by a single comma. The entire new content of the year sits in four Science Understanding descriptors.

That fact decides how you plan. A Year 6 program built only from the content descriptions is a Year 5 program with four new topics, and it will leave students at the top of primary school with no more method than they had twelve months earlier. The rise is real, it is written into the achievement standard rather than the descriptors, and it matters more this year than in any other, because Year 7 adds six codes of demand at once. This is a working guide to all twelve codes: what the four new descriptors actually ask for, the astronomy content that is not in AC9S6U02 and that almost everyone teaches anyway, the only electricity descriptor in ten years of Science, a term-by-term order with a Year 7 bridge, and the checks that tell you whether a student is ready for secondary.

What changes this year

Nothing changes in the wording, so everything that changes has to be planned by you. Four things are worth putting on the page before term starts.

• The method is identical, so the rise has to be manufactured. AC9S5I02 already asked for repeatable investigations, deciding variables, describing risks and identifying permissions on Country and Place. AC9S6I02 asks the same. If Year 5 landed properly, the Year 6 job is not to teach that again but to withdraw the last of the support: the planning frame comes off the wall, the number of trials becomes the student’s decision to justify, and the graph is chosen rather than specified.
• The four new topics are unusually independent. Habitats, astronomy, electrical circuits and reversible change share nothing. There is no strict sequence anywhere in Year 6 Understanding, which is rare and useful: the order is yours to set from the weather and from what each topic needs in setup time.
• Two of the four are one-off content. AC9S6U03 is the only descriptor in AC9 Science, Foundation to Year 10, containing the words electrical, circuit or conductor. It has no predecessor and no successor as a topic. AC9S6U01 is the last habitat descriptor in primary, and ecosystems do not return until AC9S7U02. Neither gets a second run.
• Year 7 is a step, not a slope. The inquiry strand goes from six codes to eight, human endeavour from two to four, and understanding from four to six: twelve descriptions become eighteen. Predictions become hypotheses, repeatable becomes reproducible, and two entirely new obligations appear, analysing claims for assumptions and conflicting evidence (AC9S7I06) and constructing evidence-based arguments (AC9S7I07). A Year 6 that coasts on repeated wording hands that cliff to a secondary teacher who has thirty students from six primary schools.

The year at a glance

Reading the codes

Science codes are AC9 + S + year + strand letter + number, with U for understanding, I for inquiry and H for human endeavour. Version 9 does not label the Understanding sub-strands, so they are inferred, and Year 6 breaks the order that Years 3 to 5 kept. AC9S6U01 is biological, AC9S6U02 is Earth and space, then AC9S6U03 is physical and AC9S6U04 is chemical, which is the same order as previous years, but the topics inside them are not the ones the sequence would predict: physical is electricity rather than light or forces, and chemical is a comparison of change types rather than a model of matter.

What AC9S6U02 does not say

This is the single most useful thing to know before planning Year 6, because the gap between what the descriptor asks for and what is traditionally taught in Year 6 astronomy is large, and it runs in both directions.

Seasons are not in it. The descriptor names cyclic observable phenomena and gives one example: variable day and night length. The word season appears in AC9 Science at AC9S1U02, in Year 1, where it means daily and seasonal changes in the environment, and then not again until AC9S7U03 in Year 7, where seasons are named alongside eclipses and tides. Year 6 is where seasons are usually taught and there is no Year 6 code for them. You can absolutely teach them, and the tilt work makes it natural, but they are not what this descriptor asks you to evidence, and a program that spends the unit on seasons and never measures day length has covered the example and missed the descriptor.

The moon is not in it either. AC9S6U02 names Earth, the other planets and the sun. The moon appears at AC9S2U01, in Year 2, as one of several objects with a changing position in the sky, and then at AC9S7U03 in Year 7, where its relative position is modelled and eclipses are explained. Moon phases are one of the most commonly taught Year 6 units in the country and there is no Year 6 descriptor behind them.

Gravity is not in it. The descriptor describes the movement and never says what holds it together. Gravitational force is named at AC9S4U03 in Year 4 as one force among several, and then not again until AC9S7U04. Worth knowing if you are working across borders, because the Victorian equivalent does name gravity as the cause of orbit at VC2S6U07, in the Levels 5 and 6 band. A Victorian student arriving in Year 7 will have had the connection made and a national one will not.

What the descriptor does ask for, and what is easy to under-deliver, is modelling the relationship between three specific motions and an observable cycle. Three motions: tilt, rotation on the axis, revolution around the sun. One named observable: how long the day is. That is a measurable dataset collected across months, and it is the strongest evidence artefact available anywhere in Year 6.

Strand by strand

Science understanding (AC9S6U01 to AC9S6U04)

Four independent topics, roughly a term each, and three of them need setup time booked well before the unit starts.

AC9S6U01 is the code that most often loses its verb. The descriptor asks students to investigate physical conditions and analyse how changing them affects growth and survival. Physical conditions are numbers: temperature, light, moisture, salinity, pH, shelter. A unit that describes habitats in adjectives has done the Year 4 version of this content (AC9S4U01, habitats and food chains) two years late. The analysis half needs a change, so the unit needs either a manipulated growing setup, seedlings under different light or watering regimes, or a genuine natural contrast on site: north wall against south wall, mulch against bare ground, under canopy against open.

AC9S6U02 is discussed above. Its practical constraint is timing: variable day length cannot be observed in a fortnight, so the data collection has to start in week one of the year regardless of when you teach the unit.

AC9S6U03 is the best investigation content in Year 6 and the only electricity in the whole of AC9 Science. Read the verbs carefully, because there are two of them: transfer and transformation. Transfer is energy moving along the circuit. Transformation is energy changing form, chemical in the cell becoming electrical becoming light and heat in the globe. Students describe transfer readily and almost never mention transformation, and a circuits unit that stops at “the electricity goes round” has covered half the descriptor. The insulators and conductors clause is what makes it investigable: a materials sort with a circuit as the test instrument is a clean fair test with an obvious variable.

AC9S6U04 reads like a sorting activity and is not. The descriptor supplies the criterion in its last four words: irreversible changes produce new substances. That is the whole code. Whether you personally can undo the change in a classroom is irrelevant, which is exactly the criterion students will use unless you take it off them. It is also the direct payoff from the Year 5 particle model, because dissolving is only obviously reversible if the particles are still there and still themselves.

Science inquiry (AC9S6I01 to AC9S6I06)

Six codes repeated verbatim from Year 5, which means the whole strand is a decision rather than a curriculum. Three things are worth making explicit in the program, because none of them are in the wording.

First, the scaffolds should come off this year. In Year 5 the three-line planning frame is on the wall and students fill it in. In Year 6 it should be on the page for Term 1 and gone by Term 3, with the student producing the plan unprompted. Same descriptor, different amount of help, and the amount of help is the only lever you have.

Second, the number of trials becomes a judgement. Year 5 establishes that one trial is not a result and that three trials and a mean is the standard. Year 6 should ask why three, and accept an answer: the readings are close so three is enough, the readings are all over the place so we did six. That is precision made into a decision, which is the honest Year 6 reading of AC9S6I03 and it is exactly what AC9S7I02 will call reproducibility.

Third, AC9S6I05 is where the Year 7 gap is closed or not. It asks for sources of error and for selecting evidence. AC9S7I06 will ask for assumptions, conflicting evidence and unanswered questions on top of that, and AC9S7I07 for an evidence-based argument. The cheapest way to build both is to add one habit in Term 3: whenever a conclusion is written, one sentence has to say what the result assumed, and one sentence has to say what would have to be true for the conclusion to be wrong. Neither is in the Year 6 descriptor. Both are in the Year 7 ones.

Science as a human endeavour (AC9S6H01 and AC9S6H02)

Both repeated from Year 5 word for word, and both are easier to evidence honestly in Year 6 than in Year 5, because the content suits them better. AC9S6H01, on advances coming from collaboration or building on the work of others, has an obvious carrier this year: the Earth-centred model of the solar system was not replaced because someone was cleverer, it was replaced because the measurements stopped fitting and a series of people who never met each other kept measuring. Run the idea forwards through several people, which is the descriptor, rather than backwards from one famous name, which argues against it.

AC9S6H02, on individuals and communities identifying problems and making decisions, attaches best to electricity, because the decisions are live, local and have real trade-offs: household energy use, what a school does with its roof, what to do when the network is under load. Give students the actual choice rather than the answer, since the descriptor asks for responses considered and decisions made.

The three hardest codes in Year 6

AC9S6U03: the current gets used up

The misconception: that current is consumed as it travels, so there is less of it coming back to the battery than leaving it. It is the best-documented misconception in primary physical science, and it is almost never dislodged by being told, because it matches how everything else in a child’s experience works: petrol runs out, food gets eaten, batteries go flat.

What you will see: given two identical globes in series, students predict confidently that the one nearer the battery will be brighter. Asked to draw a torch circuit, a large fraction draw a single wire from the battery to the globe, because a return path is only necessary if something has to come back. Asked what a battery contains, students say electricity, which then makes the used-up story inevitable. And asked what happens to the energy in a globe, students say it is used up too, which is the same error one level along and the reason the transformation half of the descriptor gets skipped.

The fix: make the prediction public and then break it. Set up two identical globes in series, take a show of hands on which will be brighter, and switch on. They are the same, every time, and the class has just watched its own theory fail, which is worth more than any explanation. Then give them a better story before they build a worse one: the circuit is like a bike chain, where every link moves at once and no chain is consumed, but the rider still gets tired. Charge goes round and is not used up. Energy is transferred and transformed and does run out. Insist on the two words separately in every write-up: what moved, and what changed form. And run the insulator and conductor sort as a fair test with a written plan, because it is the cleanest investigation available all year and it does the AC9S6I02 work at the same time.

AC9S6U02: a year to spin around

The misconception: that rotation and revolution are the same motion, so day and night are caused by Earth going around the sun. It survives because both are described with the word “around” and because the standard diagram shows only the orbit.

What you will see: asked how long Earth takes to go around the sun, students say a day. Asked what causes night, they say Earth has moved to the other side of the sun. Asked to demonstrate with a globe and a lamp, students walk the globe around the lamp without turning it, and cannot explain why half of it stays dark forever. Alongside that sits the geocentric habit, which is durable in language even after it is gone from belief: the sun comes up, the sun goes down, the sun moves across the sky. And asked why the days are shorter in June, most students have no answer at all, because that is the one phenomenon the descriptor actually names and the one nobody teaches.

The fix: separate the two motions physically and give each one a stopwatch. One student holds a lamp, another holds a globe and does one motion at a time. Spin without walking: day and night happen, and take a day. Walk without spinning: nothing changes about day and night, and it takes a year. Then both together. Name the two words every time and never let “goes around” stand for either. For the day length half, which is the descriptor speaking, run the data: log sunrise and sunset once a week from week one of the year and graph the day length against the date. The curve is unmistakable by mid-year, it is the class’s own dataset, and it turns a modelling code into a measured one. That graph is also the strongest piece of evidence you can put in a Year 6 portfolio, because it cannot be produced retroactively or downloaded.

AC9S6U04: new substances, not new inconveniences

The misconception: that a change is irreversible if you cannot undo it, rather than if new substances were formed. Every everyday example reinforces it, and the descriptor’s own examples make it worse, because cooking and rusting are both things a student obviously cannot undo.

What you will see: dissolving sorted as irreversible, because the sugar is gone and you cannot pick it out. Melting chocolate sorted as irreversible, because it does not go back to the same shape. Rust sorted as reversible, because you can sand it off. Tearing paper sorted as irreversible, which is the same error the other way, since nothing new was made. And underneath all of it, dissolving and melting used interchangeably, so the class has one word for two different events.

The fix: put the criterion on the board on day one and never let a sort happen without it: is there something here that was not here before? Not can I undo it. Then recover a solute in front of them, because the argument has to be made by the evidence. Weigh a sealed container of water plus a measured spoon of sugar, stir until invisible, weigh again: the number does not move, so nothing was destroyed. Leave a shallow dish of the solution on a windowsill for a week and the crystals come back. That single sequence settles dissolving as reversible, evidences AC9S6U04, and recovers the Year 5 particle model at the same time. Separate dissolving from melting with a test students can actually apply: melting needs heat and one substance, dissolving needs a second substance and does not care about heat. Set rusting up early, because a nail in salty water needs three or four weeks to make the point, and put an identical nail in boiled and sealed water beside it so the class can see which variable did it.

What students need to arrive with

From Year 5 Science, three codes gate this year, and one gap is worth naming. AC9S5U04, the particle model, is the direct prerequisite for AC9S6U04: a student who thinks particles themselves melt or shrink cannot reason about whether anything new was made. AC9S5U01, structural features and behaviours enabling survival in specific habitats, is what AC9S6U01 turns into an analysis, and the habitat half of that descriptor is where the physical conditions idea starts. AC9S5I02, deciding variables and planning repeatable investigations, is the method this whole year rests on, and since AC9S6I02 repeats it verbatim there is no second chance to teach it.

The gap is electricity. AC9S6U03 has no predecessor at all. The nearest relatives are the heat energy codes, AC9S3U03 and AC9S3U04 in Year 3, and sound energy at AC9S2U02 in Year 2, so the only thing students bring is the general idea that energy transfers between objects. Budget for teaching circuits from zero.

The maths prerequisites carry more weight this year than the Science descriptors admit, because the data work is not going to rise on its own. AC9M6ST02, interpreting and comparing data displays, and AC9M6ST03, on chance experiments and variation, are both doing work the inquiry strand needs, and AC9M6N06, using estimation and rounding to check calculations, is what makes a student notice that an averaged result is implausible. Our guide to the Year 6 Maths codes covers them, and for AC9S6I06 the purpose, audience and language features clause is the same one running through our guide to the Year 6 English codes.

What this year sets up

• The method steps up hard. Six inquiry codes become eight at AC9S7I01 to AC9S7I08. Predictions become hypotheses (AC9S7I01), repeatable becomes reproducible with variables and assumptions identified (AC9S7I02), and two obligations appear that have no Year 6 equivalent: analysing methods and claims for assumptions, conflicting evidence and unanswered questions (AC9S7I06), and constructing evidence-based arguments (AC9S7I07). Human endeavour doubles from two codes to four.
• AC9S6U01 (habitats and physical conditions) becomes AC9S7U02, using models including food webs to represent matter and energy flow in ecosystems and predicting the impact of changing abiotic and biotic factors. Abiotic factors are the physical conditions of this year, renamed, so the measurement work pays off directly.
• AC9S6U02 (Earth, the planets and the sun) becomes AC9S7U03, which finally adds the moon, and with it eclipses, seasons and tides. Everything this year’s descriptor left out arrives at once.
• AC9S6U04 (reversible and irreversible change) becomes AC9S7U05, particle theory including the attraction between particles, and AC9S7U06, pure substances against mixtures and separating them. The new-substances criterion is what makes the pure-and-impure distinction sensible.
• AC9S6U03 (electrical circuits) has no Year 7 successor. Electricity does not appear again in AC9 Science until well into secondary, so this is the only circuits content a student meets in primary school and there is no consolidation year behind it.

A term-by-term order

1. Term 1: circuits, and take the scaffolds off. AC9S6U03 first, for three reasons: it needs no weather, it is the only content in the year with genuinely obvious variables, and it is the year’s only chance at it. Run the two-globes-in-series prediction in week two so the used-up theory fails early and publicly, then the insulator and conductor sort as a written, planned fair test. This is the term to move the planning frame from the wall to the page. Two things to start in week one and forget about: the weekly sunrise and sunset log for Term 3, and a nail in salty water beside a nail in boiled sealed water for Term 2.
2. Term 2: reversible and irreversible change. AC9S6U04 in the term with the most uninterrupted indoor time, because the evidence takes weeks rather than lessons. The rust jars from Term 1 are now conclusive. Run the sealed balance demonstration for dissolving, start the recovery dish, and use the week it takes to evaporate to build the sort around the new-substances criterion. Attach AC9S6H01 here or in Term 3, whichever unit you would rather slow down.
3. Term 3: Earth, the sun, and the shortest day. AC9S6U02 after the winter solstice, with two terms of log data behind it, so the day length curve is already in the class’s own numbers before a single model is built. Graph day length against date first and explain second. Separate rotation and revolution with the lamp and globe, one motion at a time with a stopwatch on each. Attach AC9S6H01 here if it did not fit in Term 2: the solar system model changed because measurements accumulated, not because one person was clever. This is also the term to add the two Year 7 sentences to every conclusion, on assumptions and on what would make the conclusion wrong.
4. Term 4: habitats, run at Year 7 grain. AC9S6U01 when living things are most active, and as the bridge unit, because physical conditions are all measurable so the investigation can carry the Year 7 requirements without any new science. Run one extended investigation rather than three short ones: students state a hypothesis rather than a prediction (AC9S7I01), justify how many trials make it reproducible rather than being told three (AC9S7I02), and finish with a written argument that uses selected evidence to support a conclusion and names one assumption behind it (AC9S7I06 and AC9S7I07). No new content, entirely new demand, and it is the last chance to do it inside a primary classroom.

Two decisions worth defending if a reviewer asks. Circuits sit in Term 1 rather than later because there is no second opportunity: it is the only electricity descriptor in AC9 Science and a topic squeezed into a broken Term 4 is a topic a student never meets again. And astronomy sits in Term 3 rather than Term 1 purely because of the data, since a day length graph needs two terms behind it before a student can argue from it, and the winter solstice falls at the end of Term 2 so Term 3 opens with the turn already visible.

Assessment checkpoints

One diagnostic per Understanding code, plus two for the inquiry strand.

• Physical. Show two identical globes in series and ask which is brighter, then ask what the battery contains. The same, and stored energy rather than electricity, means AC9S6U03 is secure. The nearer one, or a battery full of electricity, means the used-up model is intact and needs the public prediction and the bike chain, not a correction. Follow up by asking what the globe does to the energy: an answer naming a change of form covers the transformation half that most units skip.
• Earth and space. Ask how long Earth takes to spin once and how long to go around the sun. A day and a year, given without hesitation, means AC9S6U02 is secure. Any version that gives the same answer twice means rerun the lamp and globe with one motion at a time. Then ask why the days are shorter in June: an answer referring to the tilt, or better, to the class’s own graph, means the named phenomenon in the descriptor has actually been covered.
• Chemical. Ask whether dissolving sugar is reversible and why, then ask the same about toasting bread. Answers built on whether new substances were made, rather than on whether you could undo it, mean AC9S6U04 is secure. “You cannot get the sugar back” means rerun the balance and the recovery dish, because the criterion has to be replaced rather than argued with.
• Biological. Name a habitat and ask for three physical conditions, with units. Numbers mean AC9S6U01 is secure. Adjectives, or a list of the animals that live there, mean the unit was a description rather than an investigation. Follow up by asking what would happen if one of those conditions changed, and require a mechanism rather than a verdict.
• Inquiry, independence. Hand over a question and a bench and ask for the plan in writing, with nothing on the wall. Three variable lines plus a justified number of trials means AC9S6I02 is at the Year 6 rather than the Year 5 standard. A correct plan that only appears when the frame is visible means the scaffold has not actually come off.
• Inquiry, argument. Give a conclusion and a small dataset that partly contradicts it, and ask whether the conclusion holds. Naming which evidence supports it, which does not, and what was assumed, means AC9S6I05 has been stretched far enough to survive AC9S7I06. Accepting the conclusion because it was printed means the Term 3 habit needs another term.

Records and evidence

Year 6 is the year where a portfolio should look like a method rather than a set of topics, and it is also the last year of primary, so it is the one a secondary teacher may actually read. The artefacts that carry the most weight are the day length graph, which cannot be produced retroactively and is the class’s own data; a plan written without a frame in front of the student; a results table with a justified number of trials and a mean; the rust jars photographed at three points; and a written conclusion naming a source of error and one assumption. Keep the raw sheets beside the neat write-ups, since a page of readings is direct evidence of AC9S6I03 and a typed report is not. Caption with the code and the date, so “AC9S6U03 and AC9S6I02, conductor test, five materials, three trials, 14 August” rather than “Science: electricity”.

Our guides to which curriculum your state uses and state-by-state registration requirements cover which code set applies to you and what reviewers ask for. The equivalents elsewhere are the Victorian Levels 5 and 6 Science band, where this content and Year 5’s are covered by seventeen banded codes and where evolution, mixtures, natural hazards and gravity as the cause of orbit all appear years before they do nationally, and in New South Wales the K–6 Science and Technology outcomes, which bundle Stage 3 at a much coarser grain and carry a digital technologies strand the national Science curriculum does not have.

One practical note on Year 6 specifically. Because eight of the twelve codes are already taught, the year’s real work is method on content that is free to be almost anything, and Year 6 students are the least tolerant audience in primary school for content chosen by somebody else. A conductor test on five materials discharges AC9S6I02 exactly as well whether the materials came from a science kit or from something the student cares about, and using an interest as the way in costs nothing against the descriptor. Sprout Lessons builds an interactive lesson from any of these twelve codes, pitched at Year 6 and wrapped in whatever the student is currently interested in, with the AC9 code recorded in the footer. Try it free.

Australian Curriculum content descriptions are © ACARA and licensed under CC BY 4.0. Quoted here unmodified. ACARA does not endorse this product. Always verify against the current content descriptions and achievement standards at australiancurriculum.edu.au.

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