Provide visualisations of adequate resolution. Low resolution screenshots are not suitable;
All visualisations include captions and where possible alternative text descriptions;
The context and educational importance of the content should be clear using only the text or caption;
Colour is not used in visualisations as the only means of interpreting data;
Be aware of the consequences of colour choice in visualisations. Consider colour combinations that affect colour blind users, for example red-green combinations;
Use high contrasting colours for labelling and data;
The original data on which visualisations are based is available in an accessible format where possible;
Consider the feasibility of providing tactile images;
If tactile images are used, carefully consider scale and resolution, and provide adequate labelling that works in all tactile media.