Lola: You pose some very poigant questions. I just finished a telephone conversation with a colleague in Portland Pubic Schools to get the answers to your questions. First, Investigations was adopted and mandated K-6 district-wide. The program was implemented with the "help" of approximately 10-12 TOSAs (Teachers On Special Assignment) available for consultation. These TOSAs also provided each teacher, via email, daily/weekly lesson plans for the implementation of Investigations. The implication of this is that the program was too cumbersome for the teachers to develop their OWN lesson plans. Test scores were not broken down into the areas you mentioned.
Lola, I am certainly not an opponent to change. Quite the contrary! I do, however, have an aversion to the huge swings in all curriculum that are taken. There is, and always has been, a balance. Case in point - WHOLE LANGUAGE! Investigations, and constructivist programs like it, are nothing more, in my humble opinion, WHOLE MATH! The pendulum has simply swung to far to the left. As with whole language, I'm sure eventually, math instruction will take a swing more to the center with solid, balanced math instruction.