The document discusses the regulatory structure of the European Aviation Safety Agency (EASA). It explains that EASA regulations are based on a Basic Regulation which defines essential requirements. These requirements are further implemented through specific Parts which contain rules on areas like airworthiness, flight crew licensing, and air operations. Acceptable Means of Compliance provide guidance on how to comply with the rules. The document then discusses key aspects of the Basic Regulation and implementing Parts in more detail. It emphasizes that national authorities and organizations are jointly responsible for implementing the new EASA regulations.