Here is an lecture about Jump Math by founder John Mighton:

John Mighton lecture


I also read his book 'the myth of ability' and found it really interesting. I really like Jump, and it's Canadian:) DD7 (not terribly mathy, but starting to love it) also likes Jump. I was considering switching to Singapore math because it seems to be more challenging/compact, but I do have some misgivings. I'll be following this thread to see what others have to say.

Annaliisa