Simple Organizing Trick

In our class six of our eight students are working on various levels of picture exchange, so we have six binders and a ton of picture symbols. Our students are sometimes indiscriminate when it comes to whose binder they take the symbols from (even though they are almost all different colours). This has caused us to end up with binders with three symbols for the same item. We tried keeping lists of who had what symbol in their binder but since we are always adding symbols we weren't able to keep up. We now use a simple trick to keep ourselves and our students organized:

We label the back of each picture symbol with the students first initial.