ted functions, such as positioning) and economy of service. A main target for economy of service is to enable voice over IP with reasonable efficiency. Efficient voice and video coders, header compression techniques, many WAP features and concentrating and aggregating equipment can be included within the scope of economy of service. A few more fundamental plans may be justified in practice, depending on the techni- cal context. Regarding FP I would like to refer to ITU and an extensive cooperation during the 1990s with Herbert Leijon. See for example: htp://www.itu.int/itudoc/itu-d/dept/psp/ssb/mpg/ch08.html http://www.itu.int/itudoc/itu-d/dept/psp/ssb/planitu/plandoc/corplan.pdf http://www.itu.int/itudoc/itu-d/dept/psp/ssb/mpg/ch00.pdf References and Acknowledgements The fundamental plans are parts of the 'ITU Master Plan Guide'. See for example: http://www.itu.int/ITU-D/bdtint/baap/sec1_03.html I have myself earlier treated the area in a couple of books, called Understanding Telecommunications 1 and 2, (ISBN 91-44-00212-2 and ISBN 91-44-00214-9), especially in section A.10.8.5. If still available, see http://www.ericsson.com/support/telecom/a proceed to A.10.8.5 Fundamental technical plans. I would also like to mention my cooperation with Ludvig Widell, the father of the PTP (Particular Technical Plans) concept, mentioned in the second reference and also in this book. Ludvig covered both fixed and mobile networks during the 1990s. FP and PTP can no doubt significantly support and integrate many operator processes. The cooperation with Thomas Muth has also been very valuable. Thomas covers both functions and implementation. His first book is called Modeling Telecom Networks and Systems Architecture: Conceptual Tools and Formal Methods. See position 317 in: http://www.isbn.nu/sisbn/telecommunication%20engineering::6 His next book is called Functional Structures in Networks (Springer Verlag). Thomas has been a source of inspiration especially for parts of Chapter 3. REFERENCES AND ACKNOWLEDGEMENTS FOR SEPARATE PLA