It is difficult for people with multiple learning disabilities (with visual impairment/perception problems) to interpret a visual display with many details. For people with concentration problems too many icons and choices in a visual display may make it difficult to understand the task/information.
It is therefore an advantage if graphic elements can be switched on/off. This may result in reduced functionality which is also beneficial. 1.2 Offer choices that give real variation with respect to degree of difficulty).
Choices should be saved (see 5.3 Settings should be saved).