Concepts are unique in that you can also set up exploration prerequisites. This means that learners must complete at least one Activity from the Concept (successfully or unsuccessfully) as a prerequisite to being presented another Concept. They do not need to reach their target mastery strength for the prerequisite to be met.ProTip: While Training Sessions present Activities to learners based on prerequisites, Training Moments, Learning Sessions, and Learning Moments do not consider prerequisites.The table below summarizes the differences between mastery prerequisites and exploration prerequisites.LevelMastery Prerequisites Exploration PrerequisitesMastery Profile🗙🗙Module🗙Topic🗙ConceptActivity 🗙🗙Sample ScenarioWithin the Cash Management Module, James creates a Topic on applying discounts. Within that Topic, he creates several Concepts, including one on applying promotional codes and another on applying coupons. During Training Sessions, he doesn't want his learners to be presented any information about promotional codes  until they are exposed to some information on applying coupons. To set this up, he makes the Applying Coupons Concept an exploration prerequisite to the Applying Promotional Codes Concept. This means that learners doing Training Sessions must be presented at least one Activity from the Applying Coupons Concept (either in that Session or previously) before they will be presented Activities from the Applying Promotional Codes Concept.