Project Follow Through was an almost-30-year study that compared the effect of different teaching methods on over 20,000 students nationwide. I have started reading The Outrage of Project Follow Through: 5 Million Failed Kids Later [site no longer exists, but try this book: Project Follow Through: A Case Study of Contingencies Influencing Instructional Practices of the Educational Establishment], which explains the research and its results in layman’s terms. So far, I have enjoyed the book, which is being released chapter-by-chapter every Monday. The introductory chapter will be available only for the remainder of this week, however, so if you are curious, you had better act now. I recommend downloading the pdf file to read at leisure: Right-click on the link for each chapter, then choose the “Save” option.
[Hat tip: D-Ed Reckoning, who is running a series of articles (part 1 here) highlighting his favorite parts of the book.]
Denise Gaskins' Let's Play Math 