This is a PPT presentation that I use for centers. I put my students in their color group. It is set up to stay in centers for one 15 minute rotation then a slide will pop up that says SWITCH CENTERS. The students will then switch. The way that I have it set up is that the students that work with me or another teacher in the room will stay with us for two rotations and computers and games will switch. This guarantees that everyone gets time with every center throughout the week. This is laid out for two classes with four groups in each class.