Mastery of work is the criterion of distinction between the diligent and the deficient, all people do their work, but the difference between them is in the degree of mastery of their work, and thus enables the employer to distinguish Almktnin and reward them, and put incentives to encourage others to be like their peers. Workmanship makes it easier for people to live away from hardship and fatigue. We often use certain tools in our lives to be surprised that they have been quickly disrupted to show that those who manufactured them have not mastered their work, while the tools they have mastered make them last longer and serve people more. And continues to be of interest to people because of the highly proficient in its manufacture. Mastery of work reduces costs, man and worker when he mastered his work and do it fully provides a lot of effort and money that may be made later on maintenance of different tools and this undoubtedly saves money on companies And individuals. Mastery of work People know the love of access to idealism in everything in life and their ethics, the man who mastered his work seeks to perfection and perfection in everything in the study and demand of science, and even in religion and the collection of wages. Mastery of work achieves the human self, it is the psychological needs that many people, especially those who aspire to achieve their own, and not only by performing various works with skill and skill, expressing what in the quilt of human skills and abilities could turn them by his will of energy buried in himself to actions on the ground Indeed.