There has been a growing interest in crowd simulation particularly in the commercial sector where it is used in security, defence, entertainment and the movie industry. This field is now reaching maturity and there is a need for a book that focuses closely on methods and techniques for crowd simulation, this book fills that gap. Prior approaches have been application-specific focusing on different aspects of collective behaviour and using different modelling techniques. Crowd requirements and potential strategies are discussed in the book and topics covered include population modelling, virtual human animation and computer vision techniques that are focused on crowd control and crowd rendering. The book identifies two broader areas of crowd simulations, firstly focusing on the realism of behavioural aspects and secondly looking at how to achieve high quality visualisation.