Any stimulus which, when made contingent upon a particular response, will strengthen that response. Positive reinforcement is a very effective way to influence childrenâ€™s behavior. It is one of the most basic of all guidance strategies. It can be verbal, physical, social, and tangible. It includes an encouraging phrase, a pat on the back, a smile, a favorite activity, a sticker, or other prizes. Each child will respond differently to each type of reinforcement, so in order to be effective, we must find the reinforcement which the child values. (Kaiser, Rasminsky, 2003).