y for example traffic cases, numbering and quality of service. A main reason for this approach is that plenty of system-oriented material already exists in books, on the Internet etc. The book is by no means a handbook. A handbook requires a deeper level. How- ever, by applying a sequence of subjects similar to a case study we also get a checklist and a natural sequence of the chapters. The rough case study sequence is illustrated in Figure 1.6. This could be compared with a 'real' operator network planning cycle, which may look like Figure 1.7. When managing the process sequence in a professional way you are 'Building a Successful Telecommunications Business in the 21st Century' or 'Becoming a Successful Telecommunications Operator in the Multimedia Society'. These are two interesting book title proposals from reviewers. The three main stations in the flow form a kind of triangle. Each corner has a basic chapter of its own in the book. See Figure 1.8. Some of the most critical components of the telecom business are the interfaces to the users, especially the user perception. Figure 1.9 shows (with thick rings) subject areas that have been given particular attention. Three of them have been given sepa- rate chapters: Services Security Quality of service Understanding Changing Telecommunications - Building a Successful Telecom Business Operator Network Planning Cycle Business drivers Shareholders Market strategy Strategic services plan Network strategy plan Infrastructure and capacity plan Planned network build and end-user service delivery Strategic marketing activity and resultant market demand Revenue Figure 1.7 Planning flow Telecom business actor basic part Chapter 2 1 Roles Business plan 2 End-user Identify Processes segments revenue Technical plans oppor- tunities 4 Elaborate service plan 7 Implement service 5 Identify 6 Implement solutions infrastructure Network Telecom business Network basic part basic part Chapter 4 Chapter 3 Figure 1.8 The three basic parts (thick rings) Regarding the remaining chapters