Communication of design ideas

Designers use a wide range of techniques to present, explain, and refine their ideas during the design process.

These methods help communicate intentions clearly to clients, users, manufacturers and collaborators.

Freehand Sketching (including Isometric and Perspective)

Used to quickly visualise ideas and demonstrate form, shape, and proportion.

Isometric sketches show 3D objects at 30° angles; perspective sketches show depth realistically.

Advantages	Disadvantages
Quick and intuitive to produce Helps develop initial ideas rapidly Useful for informal discussion	Can lack precision Not suitable for manufacturing detail

2D and 3D Drawings

Used to show accurate dimensions and shapes. 2D drawings focus on views and profiles, while 3D drawings display volume and structure.

Advantages	Disadvantages
Shows depth and volume — helps clients and users understand form Useful for visualising how a product will look in real life Can be produced by hand or using CAD software	Less suitable for technical manufacturing detail Perspective drawings can distort proportions Can take time and skill to create accurately

System and Schematic Diagrams

Show how electrical, pneumatic or mechanical systems work using standardised symbols.

Used for planning circuits and understanding system interactions.

Advantages	Disadvantages
Clear and precise for technical communication Can be used to troubleshoot or analyse systems	Requires understanding of standard symbols

Annotated Drawings

Combines drawings with written explanations of features, functions, and justifications for design choices.

Useful at all stages of development to show thought process and evaluate against design criteria.

Advantages	Disadvantages
Provides clear explanation of design features and decisions Supports justifying the design against the specification Useful for portfolio work and presenting to clients or assessors	Can become cluttered if not well-organised Time-consuming to annotate thoroughly Requires good literacy and communication skills

Exploded Diagrams

Shows how parts of a product fit together by displaying them separated but aligned in space.

Commonly used for assemblies, furniture, and instructions.

Advantages	Disadvantages
Makes construction and assembly clear Visually impactful and easy to understand	Time-consuming to draw accurately

Working Drawings (3rd Angle Orthographic)

Shows the front, side, and top views of a product using technical conventions.

Includes dimensions, scale, tolerances and materials – used for manufacturing.

Advantages	Disadvantages
Precise and professional Essential for manufacturing and fabrication	Requires skill to produce Time-consuming without CAD

Audio and Visual Recordings

Video, voice notes or photo evidence can support design decisions, interviews, or user feedback.

Useful for presenting work or gathering insight from stakeholders.

Mathematical Modelling

Uses formulas or calculations to predict performance – e.g. load-bearing, strength, cost, or energy use.

Helps make informed design decisions and reduce risk.

Computer-Based Tools

Includes CAD software, simulation tools, and digital sketching packages to create, analyse, and present designs.

Supports 2D/3D drawing, rendering, and file sharing.

Advantages	Disadvantages
High precision and editability Can generate working and exploded views Easy to share and collaborate	Requires training and software access Initial setup can be expensive

Physical Modelling

Working directly with card, foam, wood or fabrics to create tangible prototypes (e.g. breadboards for circuits, toiles for garments).

Used to explore form, fit, scale and usability.

Advantages	Disadvantages
Quick to understand and interact with Good for testing ergonomics and usability	May not reflect final materials or appearance Can be wasteful or costly in materials

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