Reflection - challenges of constructivism

The article "The Challenges of Sustaining a Constructivist Classroom Culture", which I listed in the Phi Delta Kappan resources in my previous post, complements chapter 1.4 (Today's Controversies in Constructivism) in our wikibook. According to this author one of the main challenges is the teacher, mainly because the teacher has to change his/her background knowledge about teaching. Our personal histories (as students and teachers) involve experiences with traditional teacher-centered instruction. Also, constructivist instruction places new demands on teachers. Using the term "facilitator" sounds simple but actually it's much more complex than being a dispenser of knowledge. The constructivist teacher not only has to be familiar with the principles of the subject/topic being studied but also must be prepared for a variety of ways students can explore these principles. Teachers must also be prepared to respond to the needs of a situation by having a wide range of strategies to support their students' understandings as they engage in problem-based projects. For constructivism to be effective in a school/classroom there must also be major changes in the curriculum, scheduling, and in assessment. Constructivist instruction requires a big committment on the part of administrators and teachers. The author recommends observing how constructivism operates in other schools. Is anyone familiar with a St. Louis area school that has constructivist instruction?