The ESA Diveleader course has been conceived for introduce and develop the techniques and the useful knowledge to plan and to manage the dives for the certified scuba divers, to participate in the daily job of the diving center and to assist the ESA Instructor during the Formative Programs ESA. The course wants to give a strong professional imprint, in terms of technical ability related to the practice of the underwater activity, to the knowledge of the environment and the carrying out of the necessary duties during the job near a diving center, a shop or an underwater club. Through the study and the practical experience under the guide of an ESA Diveleader Instructor, the participant improves his/her attitudes to the sure practice of the underwater activity and discovers his/her own abilities and his/her own limits in to assist and to drive the scuba divers and the snorkelers. The course foresees the study of the manual ESA Diveleader, the elaboration of the information from the instructor and the carrying out of the practical parts both in water and to the land. The finalities of the course are proposed to prepare the scuba divers to operate in places that mirror the conditions met during the formative phase and, after the necessary adaptation, also in different places. The approach will be the most friendly possible, realistic and it has to underline the aspects connected to the safety of the participants to all the proposed activities, to organize the dive, carrying out of the typical duties that the Diveleader will have to develop on the place of job besides the knowledge and to the respect of the environment and the management of the programs ESA Aquatrek (snorkeling). This course are again an important role in the formation of the scuba diver, in how much it will make to emerge its attitude in to want become a professional of the underwater activity and the interest toward the program ESA IC (ESA Instructor Course).