These predictions should only be treated as a suggestion. There are many confounding factors which often skew these predictions. Factors which often affect predictions are a person's procedural memory, individual differences, physical abilities, age of onset and variation in the support provided by carers.
Within ACL 4 Low, the concept of an activity frees the person from total dependence on habits to do self-care and household activities. The concept guides the person through a sequence of steps.