How to design a unit of study

A unit of study is the workhorse of curriculum design. It sits between an individual lesson and a whole-year scheme of work, and it is where most of the practical decisions about pedagogy actually happen. Get the unit right and the lessons inside it tend to fall into place. Get it wrong and you end up patching gaps with starter activities for the rest of the term.

This guide is for heads of department, middle leaders, and ECTs who have been asked to design or redesign a unit and want a method that holds up to scrutiny. What follows is a sequence of decisions, in roughly the order experienced designers make them, with notes on where teams commonly get stuck.

The worked example throughout is a Year 9 physics unit on energy: Nine lessons, taught to a mixed-ability class, leading into the Year 10 GCSE specification. The principles apply equally to a Year 7 history unit on the Norman Conquest or a Year 12 English literature unit on Othello.

The most common mistake in unit design is starting at lesson one. It feels like the natural place to begin, but it tends to produce units that drift. You spend two lessons on definitions, run out of time on application, and arrive at the assessment hoping for the best.

Work backwards instead. Before you plan any lessons, write down what you want students to be able to do at the end of the unit, in concrete terms. Not 'understand energy', which is too broad to act on, but something like 'explain how energy is transferred in three named scenarios, calculate kinetic and gravitational potential energy from given values, and evaluate the efficiency of a simple system'. That is the destination. Every lesson decision flows from it.

Christine Counsell's framing helps here: A curriculum (and a unit within it) is a body of knowledge students need to acquire in order to think well in a discipline. The end point should be a specific set of things students will know and be able to do, expressed in the language of the subject.

Once you have the end point, list the substantive knowledge students need to get there. For the energy unit, that might include the energy stores (kinetic, gravitational, elastic, thermal, chemical, nuclear, magnetic, electrostatic), the principle of conservation, the relevant equations, and the conventions for drawing energy transfer diagrams.

A common pitfall is conflating breadth with depth. Departments often try to cover everything in the specification at the same level of detail, which leaves no room to build the deep understanding the harder questions need. Mary Myatt's principle of 'fewer things in greater depth', set out in books such as The Curriculum: Gallimaufry to Coherence (2018) and Back on Track (2020), is the corrective: Pick the load-bearing ideas and give them the time they need. Touch the peripheral ones lightly and revisit them later.

Alongside substantive knowledge (the what), think about disciplinary knowledge (the how). In science, this includes how we test a claim, how we handle measurement uncertainty, how we use models. In history, it is the difference between an account and an interpretation, and how historians weigh evidence. Disciplinary knowledge tends to get squeezed out under time pressure, and it tends to be what separates strong responses from average ones at GCSE and A-Level.

Before sequencing lessons, audit what students should already know when they arrive. For the Year 9 energy unit, that likely includes the basics of forces from Year 8, arithmetic with units, and prior teaching on energy in primary or earlier KS3.

What students should know and what they actually remember are usually different things. A short, low-stakes diagnostic in the first lesson, or the lesson before, will tell you which prerequisites are secure and which need reactivation. The EEF's guidance on cognitive science is consistent on this point: New learning sticks better when it has somewhere to attach to. If the prior knowledge is shaky, the new content will not land.

This step often surfaces misconceptions worth addressing early. In energy specifically, students arrive with intuitions that energy is a fluid that flows, that it gets used up, that kinetic energy and motion are the same thing. Leaving these unchallenged means students learn the equations but apply them inconsistently.

With the end point, core knowledge, and prior knowledge in front of you, sequencing becomes a question of order rather than invention. Two principles tend to do most of the work: Build from concrete to abstract, and introduce ideas in the order that lets each new one draw on the last.

For the energy unit, that might look like the table below. The early lessons stay close to observable phenomena (a ball rolling, a stretched spring, a kettle warming); the more abstract treatment comes only once the concrete cases are familiar.

A few things to notice. The assessment is not bolted on; it is built into lesson nine and the synthesis work in lesson eight explicitly prepares for it. Conservation comes after transfers, because conservation only makes sense once students can track what is moving. Efficiency comes after dissipation, because efficiency is a quantitative way of expressing how much energy is lost. Each step builds on the previous one rather than running alongside it.

Retrieval practice and distributed practice tend to come out on top of cognitive-science reviews of what works. They are also relatively cheap to add to an existing unit, which is why they are usually the first things experienced HoDs build in when they redesign.

For retrieval, a short, low-stakes quiz at the start of each lesson is a sensible default. Five questions: Two from the previous lesson, two from earlier in the unit, one from an earlier unit or year. Students answer in books or on mini whiteboards, then you reveal the answers. It takes five to seven minutes and pays for itself in retention.

For spacing, the trick is to revisit ideas after a delay rather than only when they are fresh. If you taught the kinetic energy equation in lesson four, build a question using it into the warm-up for lesson seven, and again into the synthesis at lesson eight. Students forget less when they retrieve more often.

The end-of-unit assessment is not a separate task written the week before. It is the operational version of the end point you wrote down at the start. Designing it alongside the unit, rather than after, keeps everyone honest about what is being taught.

A workable assessment usually has three layers. A short recall section that checks the substantive knowledge has stuck. An application section that gives students an unfamiliar problem using the ideas they have been taught. And a more open question that asks them to evaluate, explain, or synthesise, which is where you find out who has reached the disciplinary thinking the unit aimed for.

Design the mark scheme at the same time. If the mark scheme is hard to write, the question is probably ambiguous. These issues are far easier to fix on paper than in retrospect.

Marking records how well students did. Feedback helps them do better next time. The two are related but not the same, and a well-designed unit makes the second one easier to deliver without doubling your workload.

The most efficient route, for most subjects, is whole-class feedback. Mark a sample of scripts, identify the three or four most common errors and gaps, and design the next lesson around addressing them. Individual comments still have a place, but should be the exception. The evidence base on written marking is thin overall, as the EEF's own review concluded; the picture that emerges is that detailed individual comments take a lot of teacher time and tend to produce uneven results, while structured whole-class follow-up can move the median student more for less effort.

Building a feedback lesson into the unit, as in lesson nine of the example, signals that responding to the assessment is part of the unit, not a footnote.

Every unit has predictable misconceptions, and experienced teachers can usually name them off the top of their heads. Writing them down before the unit is taught turns this private knowledge into a department-wide asset.

For the energy unit, predictable problem areas include treating energy as a substance, confusing weight with mass in GPE calculations, mishandling units on kinetic energy questions, and not being clear why efficiency cannot exceed 100%. A short misconceptions document, attached to the unit, lets less experienced colleagues teach it more confidently.

This is also where worked examples earn their keep. A carefully chosen worked example, with each step narrated and common slip-ups flagged, is one of the more efficient ways to head off misconceptions before they take root.

No unit lands perfectly first time. Build in a deliberate review at the end of the first cycle of teaching. What did students actually struggle with? Which lessons ran short or long? Where did the assessment surface things the unit had not prepared them for?

A short department meeting after the unit, with the assessment data in front of you, will tell you more than any abstract review. Change one or two things rather than rewriting the unit wholesale, and run it again. Over two or three cycles, a unit that started as functional will become genuinely good.