I think if we're looking at the individual, at the level of the person—I really enjoyed Rita's presentation—and if the goals are more than just knowing whether we achieved those goals or not, but are about finding a nice fit between what is meaningful to that individual--what is consistent with their values, their abilities, and their resources within their communities and within themselves--then all those individual aspects need to be part of that measurement. It's not just one outcome; there are several outcomes within that goal-setting.
In the Canadian Occupational Therapy Association, we use a guide and a tool called the Canadian Occupational Performance Measure, which allows us to quantify goals while taking all of those dimensions into consideration. Then, at the level of a larger population, we can extrapolate to generalizable goals across subsets and subpopulations, based on age as well.