Quantitative aspects of computation refer to the use of physical quantities (time, bandwidth, etc.) as well as mathematical quantities (for example, probabilities) for the characterisation of the behaviour and for determining the properties of systems. Such quantities play a central role in defining both the model of systems (architecture, language design, semantics) and the methodologies and tools for the analysis and verification of system properties. The aim of the QAPL workshop series is to discuss the explicit use of time and probability and general quantities either directly in the model or as a tool for the analysis of systems. Herbert Wiklicky (Imperial College London, UK) Dates: Saturday March 23th, 2013 and Sunday March 24th, 2013