As stated, the core ideas have been enunciated by many learning theorist. But there is a new wave of excitement about these old ideas wrapped around some new research. So, let's turn our attention to how constructivist classrooms differ from traditional classrooms. Many teachers and educator view the move to constructivist practices as a risk that may not be worth the effort. Teachers do need training in order to effectively incorporate constructivism in the classroom and many school systems just do not have the resources for this training.
Constructivism is also very time consuming.
Plus, teachers do need a great deal of patience and insight in order to deal with the individual learning that is required for true student-centered constructivism. I would also point out, that perhaps there are many situations and teachers who can serve their students better by not adopting the practices of constructivism. But for those that are willing to try the constructivist approach, the following characteristics are evident in a true constructivist classroom. It is evident that in a constructivist environment, the teacher role is more of a guide in the instructional process. Learning is an active process in which the learner uses sensory input and constructs meaning out of it.