It will also show why design decisions are made, and will bring their decision to live in the words of the Symbian key architects and developers, giving people the feeling that having a book like "story in" around the architectural presentation. This book will describe the OS architecture in terms of the Symbian system model. This will show how the model breaks the system into parts, what role the play in the system, how the parts are architected, what motivates their design, and how design has progressed through the different releases of the system. This book will include a substantial reference section itemising OS and toolkit at component level and provide reference entries for each component.