Computer rows all facing front. This design is typically for computer labs where students will be expected to work independently. Although all of the computers are facing the same direction, it is often difficult for students in the back of the classroom to see what is going on in the front of the lab. This design is also very distracting to students farther in the back because they have to look through all of the other screens between where they are sitting and the front of the room. A simple solution to this is to have them turn off their screens when you are trying to teach.
Central focus is the teacher area with a teaching screen, or projector.
This design lets the teacher see the student's screen and allows an easy line of sight from the student to the teacher when the second row of computers is slightly raised from the first level. The disadvantage to this design is if you want to walk step by step through a project. The students are then forced to constantly turn back and forth between the teacher and their computer. Much the same as the teacher centered design except for supplemental screens are placed in the corners of the room. This allows the student to see what the teacher is doing even though they are facing away from the teacher.