Accessible Moodle (implementation guide)
The implementation aid Moodle barrier-free serves as support for the Moodle barrier-free checklist. The order of the aspects and the structure according to categories are the same.
Under the heading "What is meant by this? " you will find a detailed description of the aspect to be ticked off. The section "Why is it important?" describes which barriers you are removing with the respective aspect and for which groups of people this is essential. Finally, under the heading "How can I implement/check this?" you will find detailed instructions on how to implement or check the respective aspect.
1. General
1.3. Colours for conveying information
If colors are used to convey information (e.g. in diagrams or to mark text), labels, symbols or patterns convey the same information.
What is meant by this?
It is recommended that information is not only represented by colors, but also by labels, symbols or patterns. This means, for example, that color AND pattern should be used in a diagram to represent a bar. For example, buttons in the colors green and red are also described with "yes" and "no". This creates opportunities for the information to be better perceived visually.
Why is it important?
If information is presented exclusively through colors, recipients who do not perceive all colors clearly may have difficulty understanding this information. There is a risk that information that is only conveyed via colors will be lost on such groups of people. For example, recipients with color vision deficiency have difficulty perceiving certain colors or contrasts. Colors with the same saturation can prevent full perception of what is shown and result in not all information being absorbed. Grey contrasts should also only be used to a limited extent, as recipients with colour vision problems may have difficulty recognizing certain shades of grey or differences in brightness.
Through the additional use of labels, symbols or patterns, information can be presented in multiple ways to ensure that it is accessible to groups that work independently of the color display, are distracted by bright colors or perceive stimuli very strongly.
How can I implement/check it?
Diagrams and other representations should be viewed in different ways to check accessibility, for example by hiding colors or changing the brightness to ensure that the information is easy to understand regardless of color.