Think sheet. Have the student fill this out when they have broken a classroom rule or hurt the feelings of another student, have the student reflect on their behavior and then fix the situation. I like this because it lets them think of alternatives rather than just apologizing and moving on.
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When something occurs, it is all to easy to place blame before asking what happened. If a blaming statement is said, everyone becomes defensive and ill feelings arise. When a person asks for information, like a detective, in a non-blaming way, a dialog is established that can help solve a problem in a positive way.