This European Standard has the aim of establishing a series of specifications for safety practices and the provision of services. Therefore this standard specify:- necessary levels of experience and competency of scuba divers and scuba instructors,- safety practices and requirements for recreational scuba diving service providers appropriate to the different diving levels.The requirements specified are minima; they do not preclude the provision of additional training or the assessment by a service provider of additional competencies. The Standard represents a tool for comparison of existing (or future) qualifications of scuba instructors. In no way do they represent a course programme nor do they imply that course programs and scuba instructor certifications issued by different nations or organisations must necessarily correspond to these levels.