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Dear Jim. Whoops - I think I sent that post without finishing it. Sorry. Anyway, according to "Parkinson's Disease - The Complete Guide for Patients and Caregivers" by Lieberman and Williams, the scale is used to evaluate the progression of PD thus: Stage 0 - No visible disease Stage 1 - Disease involves one side of body Stage 2 - Disease involves both sides of body but does not impair balance Stage 3 - Disease impairs balance or walking Stage 4 - Disease markedly impairs balance or walking Stage 5 - Disease results in complete immobility The areas between each stage are vague, and the time each person spends in each stage before going on to the next varies with the individual, and some people don't ever progress through the whole scale. I hope this helps. Norma