JohnC, Thanks very much for the Algorithm... When I finally succeeded in assembling it correctly, it was, in fact, all there. My husband, who has PD, read it straight through, convoluted English, medical jargon and all. It is helpful to see Parkinson's as a doctor's problem rather than as a patient's problem. In future, it may be easier to work with the doctor to define the disease. Sara Thomas ([log in to unmask])