application of communications systems. In addition, one WG focuses on communications in developing countries. TC6 meets twice a year, in spring and fall, usually co-locating its meetings with a related conference. Examples of TC6 conferences include IFIP Networking, DisCoTec, Middleware, WiOpt, CNSM, Integrated Network Management (IM) and Wireless Days (WD). Membership of a TC6 WG or SIG is open to leading researchers within the field, independent of the national society within the country of origin. Well-known (past) TC6 members include: Vint Cerf, André Danthine, Donald Davies, Roger Scantlebury, Peter Kirstein, Robert (Bob) Metcalfe, Louis Pouzin, Otto Spaniol and Hubert Zimmermann. Many were members of the International Networking Working Group. Each WG or SIG elects a chair and vice-chair for a period of three years. WG and SIG (vice-)chairs are, next to the national representatives and some key researchers, automatically members of TC6. TC6 is a strong proponent of open access and the driving force behind the IFIP TC6 Open Digital Library (DL). The IFIP TC6 Open DL is currently operated by TC6 and eventually will move to the INRIA HAL system. To ensure maximum accessibility of accepted papers, several TC6 conferences publish their proceedings not only in the IFIP TC6 Open DL, but also in other online systems, such as IEEE Xplore, ACM DL, ResearchGate and arXiv. TC6 supports conferences by providing Best Paper Awards (usually 500 Euro each) as well as Student Travel Grants (usually 750 Euro). Conference organisers who intend to obtain IFIP sponsorship are encouraged to fill-in the online Event Request Form (ERF). Depending on the category and type of event, IFIP may charge fees to conferences to cover the costs of (future) awards as well as the IFIP secretariat. The working groups of IFIP TC6 are: WG 6.1 Architectures and Protocols for Distributed Systems WG 6.2 Network and Internetwork Architectures WG 6.3 Performance of Communication Systems WG 6.4 Internet Applications Engineering WG 6.6 Management of Networks and Distributed Systems WG 6.8 Mobile and Wireless Communications WG 6.9 Communications Systems in Developing Countries WG 6.10 Photonic Networking WG 6.11 Communication Aspects of the E-World WG 6.12 Service-Oriented Systems (Joint with WG 8.10/WG2.14) In November 2015, a new Special Interest Group on "Internet of People" (IoP) was created. IFIP TC7 System Modeling and Optimization IFIP TC7 was founded in 1972 by A.V. Balakrishnan, J.L. Lions and M. Marchuk. The aims of this Technical Committee are to provide an