The diploma thesis first describes basic motivation theories and other, motivation related, subjects. Further, in reference to several extensive investigations via questionnaires taken in two different companies with more than one year gap, evaluates the motivation and satisfaction of employees. It also examines how the motivation and satisfaction changed after implementing several organizational changes; more efficient work time management, more transparent organizational structure, improved communication between managers and employees, etc. The thesis also compares the results of the questionnaires taken in those two companies and tries to find common motivators despite the fact the each company finds itself in a very different field and ...