Note: initially (2006), Mayer suggested 10 principles; meanwhile (2011) there are 12. You will find different numbers (6, 7, 10, 11, 12). Sometimes principles are indeed divided or combined, e.g. spatial (2), and temporal (3) in one contiguity principle.
If you wish more information about the different principles, check Mayer’s design principles first in the section ‘Theory’ of this module. In case you would like to know more about it, you can find additional information in the ‘In- depth’ section.