Interactive systems are growing in the last decade because of the amount of fields in which this kind of application can be used as a test bed to experiment in medicine, training, education, and so on. Developing Future Interactive Systems is a compilation of knowledge collected from several researchers in the field of interactive systems, offering an overview of the different parts of the environment that must be taken into account to develop a quality interactive system from the software engineering discipline. The book is oriented to developers of interactive systems, as well as researchers in the field of virtual environments.