Key Stage 3 design and technology · Design

KS3 design and technology: communicating design ideas

In Key Stage 3, design and technology pupils learn to get an idea out of their head and in front of other people so clearly that someone else could question it, improve it or make it. They use annotated sketches, detailed plans, three-dimensional and mathematical models, and spoken and digital presentations, and they write a specification that says what the product must do. These skills sit behind every project in Years 7 to 9 and carry straight on into GCSE design and technology.

Communicating design ideas, explained

At primary school, children sketch ideas and label them. In Years 7 to 9 the expectation moves from labelling to explaining. A label says “handle”. An annotation says “rounded 25 mm handle, so a small or stiff hand can hold it comfortably”. The difference is that an annotation gives a measurement or a reason, so a reader can see a decision was made on purpose. Teachers also ask for several quick ideas first, then one developed idea, because a pupil who only draws their first thought has nothing to compare it with.

Detailed plans are drawings that someone else could build from. Many schools teach orthographic projection, where the front, side and plan views of an object are drawn side by side with dimensions in millimetres, and isometric drawing, which shows the object as a 3-D picture on a grid of 30 degree lines. Plans may also include a cutting list, a list of parts with sizes and materials, and a production plan that puts the making steps in order. Which conventions are taught, and how formally, varies between schools, but the principle is the same: a plan must be clear enough to work from.

Pupils also model ideas in three dimensions and with numbers. A 3-D model might be a card or foam mock-up, a clay form, or a model built on screen with computer-aided design software. Mock-ups are cheap and quick, so mistakes are found before expensive materials are used. Mathematical modelling means using calculation to predict how a design will behave or what it will cost: the volume a container holds, the area of material needed, a scale drawing at 1:2 or 1:10, or a spreadsheet that compares the cost of making twenty. This is where design and technology and maths lessons meet.

Ideas must also be communicated by talking and by presentation. Pupils pitch their ideas to classmates, the teacher or an invited user, using spoken explanation, slides and models. Teachers mark the reasoning more than the polish: can the pupil say who it is for, why they chose this material and what feedback changed their mind? Good presentations also invite questions, because the aim is to improve the design, not to defend it.

Underneath all of this is the specification. The National Curriculum asks pupils to develop specifications that inform the design of innovative, functional and appealing products that respond to needs in a variety of situations. A specification is a list of requirements, each one specific enough to be tested later. “Must be strong” is too vague to test. “Must hold a 1 kg bag without bending” can be tested. Writing a good specification comes from research into users, and it is what the pupil returns to when they evaluate the finished product.

Words your child will hear

Annotation: A note on a drawing that explains a feature, usually giving a reason, a measurement or a material.
Specification: A list of requirements a product must meet, written so that each one can be tested.
Orthographic projection: A set of flat views of an object, usually front, side and plan, drawn to scale with dimensions.
Isometric drawing: A 3-D style drawing where an object is drawn on a grid of lines at 30 degrees, so all three sides can be seen.
Scale: The ratio between a drawing or model and the real object. At 1:2 the model is half the real size.
Mock-up: A quick, rough model made from cheap material to test size, shape and fit.
Mathematical modelling: Using calculations, such as volume, area or cost, to predict how a design will perform.

What the National Curriculum says

The programme of study for Key Stage 3 says:

When designing and making, pupils should be taught to develop and communicate design ideas using annotated sketches, detailed plans, 3-D and mathematical modelling, oral and digital presentations
When designing and making, pupils should be taught to develop specifications to inform the design of innovative, functional, appealing products that respond to needs in a variety of situations

Objectives from the National Curriculum in England, © Crown copyright, used under the Open Government Licence v3.0.

Try it: communicating a design for a phone stand

A pupil is designing a phone stand for a grandparent’s bedside table. How do they communicate the idea so that someone else could make it?

Start with a short specification based on talking to the user. Each point can be tested later.

1. Holds a phone up to 80 mm wide and
   12 mm thick (slot 14 mm for a case).
2. Footprint at most 120 × 100 mm.
3. Screen can be read from a bed.
4. Wipes clean.

Sketch four or five quick ideas in a few minutes each, then choose one and say why. For example, a sloping stand with a back panel was chosen because it is stable and uses little material.
Develop the chosen idea as an annotated sketch. Each note gives a reason: “14 mm slot, so a phone with a case still fits”, “rubber foot, so it does not slide on a polished table”, “sloping back, so the screen can be seen from a low angle”.
Draw a working plan with front, side and plan views, with every key dimension in millimetres, and list the materials in a cutting list.
Make a 1:2 scale mock-up from card and check the maths. Half-size values go in the model, while the real values stay on the plan.
```
Footprint: 120 mm × 100 mm
Model at 1:2 is 60 mm × 50 mm
Back panel: 120 × 80 = 9,600 mm²
9,600 ÷ 100 = 96 cm² of material
```
Present it in about a minute: who it is for, the main specification points, one thing the user said that changed the design, and what the mock-up showed. End by asking for feedback.

The design is communicated with a testable specification, reasoned annotations, a dimensioned plan, a scale model and a short pitch. Anyone who read these could tell what the stand must do, what size it is, how much material it needs and why each choice was made.

Common mistakes and how to help

Treating annotation as labelling

At primary school, naming the parts of a drawing was the task, so pupils keep writing single words such as “handle” or “wheels”.

What helps: Ask “because…?” after each label. A note that cannot finish that sentence is only a label. Suggest adding a measurement, a material or the user need that led to the choice.

Believing that a neat, coloured drawing means a good idea

Pupils spend lesson time shading and outlining, which looks like progress, while the thinking behind the drawing stays thin.

What helps: Praise the reasoning first. Ask what feedback changed the drawing, and encourage rough, quick sketches before any careful drawing.

Writing a specification in vague words

Words such as “strong”, “easy to use” and “good-looking” feel complete, but they cannot be checked, so the pupil cannot later say whether the product succeeded.

What helps: Turn each word into something measurable. “Strong” becomes “holds a 1 kg bag”. “Easy to use” becomes “opens with one hand”.

Getting scale the wrong way round

A scale of 1:2 reads as “two” and sounds bigger, so some pupils double the dimensions instead of halving them.

What helps: Say it in words: “one centimetre on the model stands for two centimetres in real life”. Check one measurement against a real object before drawing the rest.

How to help at home

Annotate an everyday object. Sketch a kettle, a school bag or a coat hook and add notes that give reasons, such as why the handle is where it is. Aim for five annotations that each include the word “because”.
Model before making. Before a real project, such as a shelf for the bedroom or a holder for charging cables, make a quick mock-up from card and tape. Look for what does not fit and change it.
Draw a room to scale. Measure a bedroom with a tape measure and draw it on squared paper at 1:20, so 5 cm on paper is 1 m in the room. Cut out card furniture to scale and try new layouts.
Pitch an idea in a minute. Ask your teenager to explain a design idea to the family, covering who it is for and why, then listen and ask one real question. It is useful practice for classroom presentations.
Write testable requirements. Pick a problem at home, such as shoes piling up by the door, and write three requirements that could be tested, such as “holds six pairs” or “fits a space 60 cm wide”.

Builds on

Key Stage 2: Research and design criteria
Key Stage 2: Sketches and exploded diagrams
Key Stage 2: Prototypes, patterns and CAD