A popular textbook on special education (Rosenberg, et. al, 2008), notes that up to 50% of students with learning disabilities have been shown to overcome their learning difficulties when given explicit instruction.So the sequence is:
Mathematics Education: Outwitted by Stupidity Barry Garelick
a. Collaborative group inquiry with spiraling
b. Huge increase in children diagnosed w/learning disabilities
c. Provision of explicit instruction (w/o spiraling?) to children diagnosed w/learning disabilities
d. Followed by 50% of learning disabilities resolving
Back on my home planet, we didn't bother with Steps A, B, and D.