Managers rely on management theories to motivate employees, allocate resources, negotiate deals, or make decisions. Management theories are defined as management concepts and strategies which include tools, guidelines, and frameworks which are used to run modern organizations. Managers rely on several theories to make decisions that best suit company culture and workforce. Although older theories are still relevant, new theories have been developed in line with the current practices in the business world. Managers use management theories to enhance productivity and improve service quality. Some of the popularly applied management theories are contingency theory, system theory, chaos theory, and theory X and theory Y.