The Feather & Williamson Model is an analytical tool for drawdown analysis in multi-layered aquifer systems.  The model provides an alternative analytical framework that aims to: a) provide a fast and convenient alternative to the development of numerical modelling solutions; b) consider multi-layered systems with heterogeneous hydraulic characteristics in each layer; and c) overcome conservatism in earlier analytical models by considering flow release from storage during pumping.  A paper is being prepared to describe the FWM, but in the meantime we encourage people to trial the software and satisfy themselves of its varacity.