NCTM is a huge organization for teachers of mathematics in the US, and it has certainly had a strong impact through the years. Michael Paul Goldenberg – author of the blog: Rational Mathematics Education – has written a very long and interesting article where he criticize this grand organization. For me – a Norwegian researcher with both legs planted firmly in Europe – this provides an interesting insight into the US discourse. I recommend reading the article, whether you agree with his views or not!