In his 1990 study, Kahn found that people become engaged in or disengaged from their work as a result of three psychological conditions: meaningfulness, safety, and availability. Psychological meaningfulness is higher when a person is engaged in tasks that are challenging and varied and have clear expectations and creative aspects,as well as when workers are allowed a level of autonomy. The availability of opportunities to demonstrate competence using previous skill sand to learn and grow by developing new skills canal so positively affect meaningfulness. The condition of psychological availability is dependent on physical and emotional energy, feelings of security or insecurity, and stability in the individual’s outside life.