Company size greatly affects the project that the manager is handling. it could change budget, team member size, and in some cases the quality of the workers that the manager has. It is important for the manager to be able to adapt to different enviornments and handle different companies well. A project manager that has a lot of experience at a smaller company may struggle with the change to a larger company. The might lose track of money, not be able to handle the workload, or may not be able to handle larger egos of higher level employees.