 The current method of teaching Basic Life Support BLS courses involves a practice schedule where learners rotate through each station once, without repetition. Laypeople learning within this blocked schedule may experience poor skill retention, resulting in suboptimal delivery of Cardiopulmonary Resuscitation CPR. Implementing a Contextual Interference CI practice scheduling method to BLS training would involve presenting each station multiple times within the same timeframe. CI is known to lead to better retention in other domains, such as sport and engineering. Our project will test the effect of CI on the long-term retention of BLS skills. We hypothesize that participants trained in BLS using CI techniques will have superior skill retention at 3 months compared to those trained with the conventional BLS course. 