To carry out their roles, first responders need to have appropriate skills. It is important to identify and train in key skills appropriate for the tasks that first responders will perform. Once these skills have been acquired, they need to be maintained otherwise they will decay to the point where performance of the skill is no longer acceptable. This means that emergency services organisations need programs that appropriately maintain the skills of their volunteers and employees. To deliver cost-effective training, these organisations need a good understanding of what key skills are required for tasks that are regularly performed, why and how quickly these skills decay and how these skills can be maintained. To help emergency services organisations better understand these important concepts, this paper reviews relevant literature on skill decay and skill maintenance. Task decomposition methods and training needs analysis are introduced to assist organisations determine what key skills they require. This provides information to make sound, evidence-based decisions about recurrent training programs that can maintain the skills required by first responders and retain efficacy in the organisation.