Diploma thesis is focused on enterprise planning. The main part of the thesis is dedicated to the design of the planning model in the SW company, which comes from real condition of big SW company. The first chapter introduces the world of enterprise planning to the reader. There are clarified reasons of current rise of demand in this area of planning and the advantages of its use. The following chapter explains the essential theory related to enterprise planning area. It also mentions other system approaches to enterprise planning. In the end of the chapter there are described main principles of the CPM concept and its relation to enterprise planning. The fourth chapter is aimed at the current state, requirements and the issues of the plann...