which is also available in 5-times-the-page-count-and-costs-$10.
Then you should pay them 10 years of generous salary to produce a curriculum and write model textbooks. You need both of that. (If you let someone else write the textbook, the priors say that the textbook will probably suck, and then everyone will blame the curriculum authors. And you, for organizing this whole mess.) They should probably also write model tests.
The problem undergirding the problem you’re talking about is not just that nobody’s decided to “put the smart people who know math and can teach effectively in a room and let them write the curriculum.” As a matter of fact, both New Math and the Common Core involved people with at least all but point 2, and the premise that elementary school teachers are best qualified to undertake this project is a flawed one (if it’s a necessity, then Lockhart may be the most famous exemplar adjacent to your goals, and reading his essay or book should take priority over trying to theorize or recruit other similar specialists.
This argument is in no small part covered in
https://worrydream.com/refs/Lockhart_2002_-_A_Mathematician’s_Lament.pdf
which is also available in 5-times-the-page-count-and-costs-$10.
The problem undergirding the problem you’re talking about is not just that nobody’s decided to “put the smart people who know math and can teach effectively in a room and let them write the curriculum.” As a matter of fact, both New Math and the Common Core involved people with at least all but point 2, and the premise that elementary school teachers are best qualified to undertake this project is a flawed one (if it’s a necessity, then Lockhart may be the most famous exemplar adjacent to your goals, and reading his essay or book should take priority over trying to theorize or recruit other similar specialists.