The document discusses the limitations of constructivism as an educational theory and teaching approach. It is difficult to implement constructivism in the classroom because there are many different versions and it is hard to see how the pieces fit together into a coherent idea. Constructivism requires teachers to be experts in areas like child development, observation, and diagnosis, but teachers are often ill-prepared for this approach. When not implemented properly, constructivist teaching can be disorganized and detrimental for students, especially those with disabilities who need more direct instruction. The document calls for a more prescriptive theory of constructivism that provides clearer guidance for teachers.