The National Council for Swim Safety has linked each level of swimming safety to a Swim ABC diploma. You meet the National Standard for Swim Safety when you have completed the full Swim ABC. Diplomas A and B are intermediate steps towards the complete Swim ABC.
Swimming Diploma A: You master skills for a swimming pool without attractions.
Swimming Diploma B: You master skills for a swimming pool with attractions, such as a (wildwater) slide, a wave pool, and a current.
Swimming Diploma C: You master skills for a swimming pool with attractions and in open water without currents or heavy waves, such as recreational lakes and wider canals (except the sea). With this diploma, you meet the National Standard for Swimming Proficiency.