Star system review

Considering we target children from 2 to 10, basically we have 6 levels for a range of 9 years. We can on average make this kind of table:

• 1 star (1 yellow star)  : 2 to 3,5 years old
• 2 stars (2 yellow stars) : 3,5 to 5 years old
• 3 stars (3 yellow stars) : 5 to 6,5 years old
• 4 stars (1 red star)  : 6,5 to 8 years old
• 5 stars (2 red stars)  : 8 to 9,5 years old
• 6 stars (3 red stars)  : 9,5 to 11 years old

This table can be convenient to evaluate the star level to use for each Activity/Dataset, but remember that it's still very arbitrary as children skills can vary a lot (depending on environment, time spent studying and other things...).

Also, activities can even be used by adults, so it's just a relative reference.