This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book considers the requirements and development of each nascent, independently run, air service as the war progressed. It examines elements of air power; therefore it is important to define its meaning. The book discusses how organization and doctrine were affected from early times until 1918. It also examines the similarities, and differences, between the Royal Naval Air Service (RNAS) and Imperial German Naval Air Service (IGNAS) understanding of naval air power within the broader strategic and theoretical framework of the parent organizations, the Royal Navy (RN) and the Kaiserlichemarine-Imperial German Navy (KM). The book describes how the British Committee of Imperial Defence (CID), replaced a defunct Colonial Defence Committee (CDC) with one designed to include the elements necessary to provide the Prime Minister of the day with information which could help him solve problems inherent in strategic planning.