Our goal is to get the learner to true mastery — accurate, fast, and with self-assessed “high” confidence.There is a “cost” associated with confidence selection that rewards learners by increasing their mastery strength when they are both confident and proficient, and decreases it when they are not.By proficiency, we are referring not just to accuracy, but also whether the learner responded within a certain duration and met other criteria.The effect of confidence selection varies, depending on the learner's current mastery strength on a Concept. The image below shows how a learner’s mastery strength is affected by a combination of their proficiency and confidence when they are at or below their target mastery strength for a Concept:When learners are above their target mastery strength for a Concept, they will drop 1 level if they answer correctly with low confidence.