Clinician reported Outcome. A 10-point classification designed originally for DMD. It contains 8 grades of walking and standing and two grades for non-ambulatory ability. 

Activity

Developed for DMD but also used in SMA 

Ambulatory and non-ambulatory 

Can be a quick method of summarising mobility however it lacks sensitivity in non-ambulatory subjects. It may not always capture progression in a hierarchical way. For example, the ability to stand up from a chair / climb stairs do not follow the same pattern for all subjects.