(there's also a free center menu that's editable on that post! I explain the menu a little more on that post too)
Since I have enough to only have 2 kids at each center, then that's the rule (so far...it might change if I change up the centers later). If their clip doesn't fit on the clear strip, then they can't pick that center. They only do ONE center each day. When it's center time, then they finish up their seatwork (whatever that may be), and then get their bucket, which corresponds with the center label on the pocket chart.
They take their bucket and find a spot in the room with their buddy. Sometimes it's a pocket chart, sometimes the computer, it varies. You can see inside the bucket is all of their materials they'll need for it, except for their clipboard and pencil. I have the glue, scissors, dry erase markers, and directions and materials in there for them.
Once they finish their center, they clean up all the materials and put the buckets back. They put their center recording sheet on their desk (whether it's a dry erase pocket, a laminated Scholastic News, or a regular recording sheet.) and wait for me to come check it after I am finished with my reading groups. Then I check off their center menu. If they didn't finish it, then I circle the box where it says T.S. and if they did finish it (and to my liking) then I give them a star, sticker, or just my initials. While they are waiting on me to come check their center, they can go to OLD centers they need to finish on their menu, or they can finish other work, or read and take A.R. quizzes.
Now, where do they keep their paper recording sheets and menu? In a center folder. Simple. At the end of the 2 weeks, I staple all the (real) papers to the menu and send it home with a "grade" on the menu.
Now, you may have noticed that my labels and buckets are 2 different colors. One set is blue and the other set is green. Yep. And it's on purpose. My BIGGEST reason is because last year I had 5 reading centers and 5 math centers. BUT, I'm not doing actual math centers right now (in the same format as I am reading centers). We are still introducing a lot of other skills and procedures and basics in math, and I don't want to throw too much at them at once. I DO have them set up right now, so that we can use them when we have the time, and I'm just going to give the buckets to my groups, that way I can keep track of which group is doing which center.