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.
Instrumental activities of daily living (IADLs) are done often, but not every day, which makes them less automatic or habitual. IADLs enter the scale in ACL 4.0 and are referred to as household management tasks.