Teacher Centered or Student Centered?

What is the difference between teacher-centered and student-centered instructional strategies? What is the appropriate role of each strategy in K-12 eLearning environments?

I used to think that teacher-centered learning (TCL) experiences were ones where they teacher did all of the work -- and all of the talking. TCL meant that I was the sage on the stage. I had the wisdom and I imparted it to the students. I also believed that student-centered learning (SCL) was when I (the teacher) provided my students with a loose framework, but that they had to fill in the framework with stuff. I was the guide on the side.

Now I see that neither -- and both -- are correct. TCL takes place when the teacher determine that the whole group can benefit form a presentation or a demonstration. This is also when the teacher makes lessons available (perhaps in video format on the Internet) so that students who need a refresher (tutorial) can access them. A teacher can learn during TCL.

SCL is when the teacher feels that small groups, games or simulation will enhance student learning. If the teacher sees that in order to fully master a concept, a simulation may be the best instructional method. Problem based learning -- where student investigate real world issues and formulate solutions -- is a SCL strategy. 

The difference between TCL and SCL is not only the size of the group, but also the activity and the rationale for the instructional method.

In the K-12 eLearning environment, both TCL and SCL are appropriate strategies. Like an accordion, a teacher in an eLearning environment will switch back and forth between these two strategies as needed for most efficient student mastery. With the asynchronous delivery of instruction in an eLearning environment, even TCL takes on the appearance of SCL. A hybrid of the two strategies will best serve students