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This special issue contains four papers selected from the 26th UK Performance Engineering Workshop (UKPEW), which was held during 8–9 July 2010 in the Department of Computer Science at the University of Warwick. UKPEW is the leading UK forum for the presentation of work relating to all aspects of performance modelling and the analysis of computer and telecommunication systems. This year's selected papers demonstrate the variety of topics on offer at UKPEW: performance issues in cloud computing, energy-aware routing in packet networks, source location privacy and multi-hop ad hoc networks for wireless networks. [ABSTRACT FROM AUTHOR]

This special issue includes research papers related to a workshop held at the Royal Society on 21st of September 2010, honouring Erol Gelenbe on his 65th birthday. The workshop brought together some 40 participants including some of Erol's former and current PhD students, colleagues and friends with whom he has interacted over the years, both in Europe and the USA. The papers focus on probability models in computer science, at the core of the field of computer performance engineering, which Erol pioneered. [ABSTRACT FROM AUTHOR]