The ACLS-6 is used to record the person's pattern of performance using standardized activities. Being in an updatable App format means that clinicians around the world may use the same activities and same measurement methods to discuss their observations. New activities may be added without huge shipping costs and materials may be printed relatively inexpensively.
A recording sheet for the ACLS-6 is downloadable here (add link). Many activities are used to help establish a pattern of performance. Being able to establish a pattern of performance means we can have more confidence in our predictions. Using an ordinal scale which uses a conceptual frame work where we can verify information being used and rule out higher information that is ignored allows us to predict the person's ability to function.