Making concrete improvements makes sense to the person in ACL 5 Low.
The person has a sense of I am learning how to improve what I am doing. They are able to store information in their short-term memory spontaneously from their working memory. They can store an image for about 30 to 45 seconds and thus do not need to refer to the sample per action.
Having opportunities to learn to improve on what they can tangibly see helps them achieve a sense of satisfaction and accomplishment.