Simulators are devices that provide personnel with training and practice by reproducing the behaviour of operational equipment. Defence records indicate that since 1960 the Defence Organisation has spent about $1 billion on acquiring simulators for training purposes. Over the next five years Defence proposes to spend a further $1.1 billion on simulation. The objective of the audit was to assess whether Defence had developed appropriate policies to provide guidance to personnel in the acquisition and use of aerospace simulators and the effectiveness of its procedures in achieving best value for the Commonwealth in relation to aerospace simulators.