Biokerosene is seen as an important option to make civil aviation more environmentally sound and climatic friendly. Thus a lot of research and development as well as demonstration activities have been carried out in recent years. Against this background the overall goal of the following explanations is it to provide an overview how the current status of biokerosene is tackled and how these activities are presented within this book; i.e. the structure and the logic behind the following papers is discussed. This makes it easier to find special information and/or to get hold of the desired interrelationships.