Writing material for educational courses

Principle 5Diagrams

Glenn MartinMarch 2017

Principle 5 If using diagrams, ensure that all elements

of the diagrams serve to convey the meaning required, and the relationships between the elements accord with the meaning intended.

What is a diagram? A diagram is a sentence in

a graphical language. The purpose of diagrams is

to enhance understanding over and above what is conveyed by text.

What is a “good” diagram? A “good” diagram is one which

communicates effectively. Communication (or cognitive)

effectiveness is measured by the speed, ease and accuracy with which the information content can be understood.

(“The ideal career”)

Aesthetics and meaning What looks good is not

always what communicates most effectively, but aesthetics can support and enhance the message.

Overviews Diagrams (and illustrations) can be used to

provide an overview of a topic (the “big picture”).

Detailed views Diagrams can be used to

give a more detailed account of specific situations, dynamics and processes.

The elements of diagrams Diagrams are built up using shapes, lines,

arrows and text, which may vary in colour, texture and size (and fonts, for text).

Elements are chosen and combined to show relationships, position and movement.

Graphics Meaning

Check…. Check for ambiguity, relevance, logic and

consistency.