Behavior is observable outcome of the teacher that affects the student performance in different activities in institution. Behaviors may be positive or negative and effective and ineffective. A behavior produces the requisite results. Behaviors are the action, which is different at different time. There are three types of behavior, thinking, feeling and doing. The classification of thinking behavior is very important for learning process and it can be divided into three domains. These domains are cognitive, affective and psychomotor. Cognitive behavior consists on knowledge outcomes and intellectual abilities and skills. Affective behavior based on individuals hidden abilities likes, attitude, interests, appreciation and modes of adjustment. Psychomotor domain based on perceptual and motor skills .<br />Keywords: behavior,skills,learners<br />Prof Dr.Mazin Hadi kzar<br />Al-Mustaqbal University College<br />[email protected]