ction concern the important struc- turing of the 'house'. The 'room furniture' may be continuously changed, following the new standards from bodies such as 3GPP, ITU, IETF, ETSI and many others. Evidently, a book with a fairly long production time like this one cannot include all the latest 'furniture'. However, the web often provides information on new standards. About the Author Anders Olsson has worked for many years as a network designer in Sweden (Televerket, nowadays TeliaSonera), Colombia (Telecom) and Tanzania (TP & TC), and in 1991 was appointed senior expert in Network oriented training at Ericsson. References and Acknowledgements FUNCTIONAL STRUCTURE AND RELATED ACKNOWLEDGEMENTS The most important applied structure is called Fundamental (Technical) Plans (FP). The plans can indeed also reach beyond pure technique, such as organization. The main author has worked within this area as a consultant and as a teacher for many years, starting in the 1970s. The students have represented operators from all over the world. Historically, after a long stable period during the twentieth century, digitization brought the need for a synchronization plan in addition to a basic set of plans. The area of IN and mobility were the next challenges to the basic 'FP house design'. A main contribution was a mobility management plan. Then IP entered the overall telecom area, giving a new touch to the quality of service plan, urging for a separate security plan and for a controllable convergence. The FP view supports no doubt an orderly convergence between technologies. After all, all technologies have a common target: to connect communicating parties in a satisfactory way, technically and economically. Proceeding with the plans, the deregulation and the evolving global networks demanded more attention to the establishment of an interconnect plan. In this book another two areas are included, without being necessarily labelled FPs: service layer enablers (other than those belonging to established plans; for example content-orien