Communicate a design so others can make it
Choose sketches, presentation and working drawings that communicate shape, dimensions, assembly and production plans.
This lesson is original StudyForA learning support aligned to Cambridge International AS & A Level Design & Technology 9705. It is not Cambridge material or an official mark scheme. Practical activity must follow the learner's centre procedures and trained supervision.
Before you begin
- Read the product brief and identify its intended user and context.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which drawing best communicates exact lengths and hole positions for making a part?
What you will learn
- 9705 T3 presentation
- 9705 T3 working drawings
- 9705 T3 planning drawings
- 9705 T3 digital communication
Select a drawing for its purpose
Freehand sketches explore ideas quickly. Exploded and sectional views reveal assembly or hidden form; isometric and planometric drawings communicate three-dimensional shape; perspective suggests appearance. Tone, colour, material representation and shadows can clarify a proposal, but must not hide important geometry.
First- and third-angle orthographic drawings communicate dimensions and shape consistently. Include projection convention, scale, clear units, dimensions, part drawings and sections where needed. A development or net should include joining allowances and form the intended solid when assembled.
Plan the work and use digital channels carefully
Flowcharts show process order, Gantt charts show tasks over time, and material or cutting lists help organise resources. Each drawing should be legible to its intended audience and use specialist vocabulary consistently.
Digital tools such as word processors, spreadsheets, presentation and collaboration software can share design information. Confirm file versions, access, units and ownership; a digital rendering is not a substitute for a dimensioned working drawing when manufacture depends on exact sizes.
Sources for this lesson
Pause and explain
Which principle best supports this lesson: communicate a design so others can make it?
Worked example
A maker must produce a rectangular casing with a slot and removable lid. Which two views would communicate its shape and manufacture best?
Show the worked solution
- Use a 3D presentation view to show the casing and lid relationship.
- Add orthographic views with dimensions and a section or detail for the slot and joining features.
- Label scale, units and part references so the drawing can be checked.
Answer An isometric or planometric view can explain the overall form; dimensioned orthographic and section details are needed for manufacture. A view choice depends on what information the maker needs, and dimensions should be checked against the chosen scale.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
A folded card package needs a flat cutting pattern and a view of the assembled shape. What should the designer prepare?
Give me a hint
One view shows the flat blank; another clarifies the assembled form.
Compare my reasoning
- Draw a development with panels, tabs and fold or cut conventions.
- Add an assembled 3D view and any dimensions needed to check size.
- Make a test net from suitable card and compare the assembled result with the drawing.
Prepare a dimensioned net showing panels, folds, cuts and joining tabs, plus a 3D view of the assembled package. A physical paper prototype can reveal missing or misplaced tabs before production; the drawing should be revised from that test.
Look for these in your work
- Distinguishes net from 3D view
- Includes joining information
- Validates with a prototype
A team is late because two people use different versions of a drawing. Suggest a communication and planning fix.
Give me a hint
Combine clear revision control with a visible task sequence.
Compare my reasoning
- Assign a clear filename, revision and date to the approved drawing.
- Share it in one agreed location with access controls.
- Use a simple schedule or task board and notify the team when revisions change.
Use one controlled location with a named, dated revision and make the current version obvious. A Gantt chart or shared task board can show dependencies and ownership. The team should confirm units and review updates; software alone does not prevent a wrong revision being used.
Look for these in your work
- Controls versions
- Identifies a suitable planning tool
- Includes a human confirmation step
A 1:2 orthographic drawing shows a 60 mm feature when measured on paper. What is its real size, and what must still be checked?
Give me a hint
A 1:2 drawing is half-size; use the stated scale rather than assuming the paper is exact.
Compare my reasoning
- Interpret 1:2 as one drawing unit for two real units.
- Multiply 60 mm by 2.
- Check the printed or displayed scale and any written dimensions.
The real feature is 120 mm if the drawing scale is correctly reproduced. Check the scale bar or stated dimensions because screen zoom and printing can change the physical measurement; written dimensions take precedence for manufacture.
Look for these in your work
- Applies the scale in the correct direction
- Retains millimetres
- Checks reproduction and dimensions
Common mistakes
- Using a perspective sketch as the only manufacturing drawing
- Leaving dimensions or units ambiguous
- Using shading that conceals the actual geometry
What can you explain now?
Which drawing best communicates exact lengths and hole positions for making a part?
Compare with the explanation
A dimensioned orthographic working drawing
A perspective sketch helps show appearance; orthographic views with dimensions are suitable for precise manufacture.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
When is an isometric view useful, and which drawing adds the measurements needed to make the part?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.