We know effective numeracy teaching goes through the process concrete, pictorial to abstract!
I love providing my kids with concrete materials to use but sometimes despite clear objectives some little munchkins don't use their materials effectively.
That is where the licence comes in :) Students need to PROVE they are able to use them effectively to gain the licence and more importantly keep it!
The students LOVE when they receive their certificate! They feel so proud!!! :)
Hope it helps in your classroom :)