ations 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 revenue segments 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, three are partly process oriented: Service implementation Interconnect Telecom management - operations Introduction Charging, affordability Telecom business chapter 5 actor basic part Chapter 2 1 Roles Business plan 2 End-user Processes Identify segments revenue Technical plans oppor- tunities Basic part Basic part Basic part 4 Elaborate Chapter 5 Chapter 6 Chapter 7 service plan 7 Implement service 5 Identify 6 Implement Services, security, QoS solutions infrastructure Crucial for user perception Network Telecom Network business basic part basic part Chapter 3 Chapter 4 Figure 1.9 Chapters that relate to the user interface whereas the others are segments of the new network. The network is split into three dimen- sions: the layered dimension, the distributed dimension and the processing dimension. The chapters embrace the following netwo