Ernie, You don't say what your C.V. is so I can only assume that you are an experienced researcher. As you indicated, much thought must be given to the experimental design, both to how the data are to be collected and to how they are to be analyzed. Also you made no mention of a control group. Although your proposal would only be an observation the statistic obtained from it would have meaning only in comparison with a "norm". My area of specialization is in developing statistical models of patients which will aid the healthcare provider in determining a risk assesment for the patient and in determining the effecacy of alternative treatment regimens. (My ultimate goal is to develop a model for PD.) I would be willing to help you with developing and analyzing the survey if enough people express an interest in it. Bruce 55/8 Sinemet CR & Pramipexole ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Bruce G. Warr, Ph.D. "Experience is what enables us to recognize Healthcare Informatics Lab a mistake the next time we make it." Information Systems Dept. University of Maryland Baltimore County http://umbc.edu/~warr/ (V) (410)455-3206 (F) (410)455-1073 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~