The school I am familiar with comes up with a totally new concept of teaching math about every 3 to 4 years. Seems to me like someone gets a PHD developing a "new math" and some ambitious administrator decides it's time to change. Of course this puts a terrible burden on teachers and parents that are trying to be consistent with the children. How many times have you heard, "my mom says she doesnt understand this "new math"? In fact just about the time the teachers catch on to the "new math", bingo, it's time to change. Who is in charge of curriculum?