How do designers communicate ideas, and which drawing and presentation techniques suit different purposes?
Communicating design ideas: freehand and formal sketching, rendering, isometric and orthographic (third-angle) projection, exploded and assembly drawings, working drawings and CAD visualisations, and choosing the right technique for the audience and purpose.
A focused answer to OCR A-Level Product Design on communicating design ideas: freehand and formal sketching, rendering, isometric and orthographic (third-angle) projection, exploded and assembly drawings, working drawings and CAD visualisations, and how to choose the right technique for the audience and purpose.
Reviewed by: AI editorial process; not yet individually human-reviewed
Have a quick question? Jump to the Q&A page
Jump to a section
What this dot point is asking
OCR wants you to know the main drawing and presentation techniques, what each shows, and how to choose the right one for the audience and purpose. Communication runs through the whole process: ideas only progress if they are understood by the team, the client and the manufacturer.
Sketching and rendering for ideas and presentation
The exam point is purpose: sketches generate and discuss ideas; renders persuade an audience.
Isometric and orthographic projection
Isometric is for communicating a 3D idea; orthographic is for communicating exact manufacturing information.
Exploded, assembly and working drawings
CAD visualisation and choosing the technique
Exam-style practice questions
Practice questions written in the style of OCR exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
OCR 20194 marksState what an orthographic (third-angle) drawing shows and what an exploded drawing shows, and explain why each is useful to a manufacturer.Show worked answer →
A Component 02 short-answer question. Marks for each description and its use.
Award marks for: an orthographic (third-angle) projection shows a product in separate flat views (front, plan and side) with accurate dimensions and a scale, so the manufacturer has the exact sizes needed to make each part. An exploded drawing shows the components separated along their assembly axes (pulled apart but aligned), so the manufacturer or user can see how the parts fit together and in what order they assemble. Each is useful because the orthographic gives the precise sizes for making parts, while the exploded view gives the assembly sequence and the relationship between parts.
A common dropped mark is confusing the two: orthographic gives dimensioned flat views for manufacture; exploded shows how parts assemble.
OCR 20218 marksDiscuss how a designer chooses appropriate drawing and presentation techniques at different stages of a project and for different audiences. Refer to specific techniques.Show worked answer →
A Component 02 levels-of-response question (AO2 plus AO3), marked by levels.
A top-level answer links techniques to stage and audience and weighs them. Early on, quick freehand sketches and annotated thumbnails explore many ideas fast and communicate them to the design team. Rendered presentation drawings (with colour, shading, materials and context) sell the concept to a client or in a pitch, because they show how the product will look. Isometric drawings give a clear 3D impression for discussion. Orthographic (third-angle) working drawings give the manufacturer exact dimensions, tolerances and a scale, and exploded and assembly drawings show how parts fit and assemble. CAD visualisations and renders combine accuracy with photoreal presentation and feed straight to manufacture. The evaluation should weigh that the right technique depends on the audience (a client wants a render, a manufacturer wants a dimensioned working drawing) and the stage (sketches early, working drawings late), and conclude that matching the technique to purpose and audience is what makes communication effective.
Markers reward linking techniques to stage and audience with a judgement, not a list of drawing types.
Related dot points
- Iterative design as a cycle of explore, create and evaluate, and the design strategies that drive it: user-centred design, collaboration and co-design, systems thinking, and the distinction between iterative and linear design.
A focused answer to OCR A-Level Product Design on iterative design and design strategies: the explore, create, evaluate cycle, the difference between iterative and linear design, user-centred design, collaboration and co-design, and systems thinking, with how each shapes the way products are developed.
- Design briefs and design specifications: the difference between them, writing measurable and justified specification criteria (using a framework such as ACCESSFM), and the role of the specification in evaluating a design and judging its viability.
A focused answer to OCR A-Level Product Design on design briefs and specifications: the difference between a broad brief and a measurable specification, writing justified design criteria using the ACCESSFM framework, and using the specification to evaluate a design and judge its viability.
- Primary and secondary research methods, the use of anthropometric and market data, and modelling and prototyping (sketch models, CAD models, working prototypes) to develop, test and refine design ideas through the iterative cycle.
A focused answer to OCR A-Level Product Design on research and modelling: primary and secondary research methods, the use of anthropometric and market data, and modelling and prototyping (sketch models, CAD models and working prototypes) to develop, test and refine ideas through the iterative cycle.
- Digital design and manufacture: CAD modelling, CAM and CNC machining, 3D printing (additive manufacture), laser cutting, and their effects on accuracy, repeatability, iteration speed, mass customisation and the role of the designer.
A focused answer to OCR A-Level Product Design on digital design and manufacture: CAD modelling, CAM and CNC machining, additive manufacture (3D printing), laser cutting, and their effects on accuracy, repeatability, iteration speed, mass customisation and employment.
- Scale, ratio and tolerance calculations: scale factors and reading scale drawings, ratio and proportion, tolerance limits and bands, and the use of these in technical drawings and dimensioning, with worked calculations.
A focused answer to OCR A-Level Product Design on scale, ratio and tolerance calculations: scale factors and reading scale drawings, ratio and proportion, tolerance limits and bands, and their use in technical drawings and dimensioning, with worked calculations.
Sources & how we know this
- OCR A Level Design and Technology (H404-H406) specification — OCR (2017)