This volume contains papers presented at the 11th annual workshop, held in Liverpool from 5-6 September 1995. The main focus of the workshop was on applying performance/reliability modelling and measurement techniques to the design of efficient and dependable computer and communication systems. There was also a strong emphasis on aspects relating to multimedia networking and applications. The resulting volume provides an up-to-date assessment of the work being carried out by performance engineers in Europe and the UK. It should provide a useful reference for researchers and practitioners who wish to familiarize themselves with the benefits of performance analysis.