When we say “evidence-based”, we are looking at randomized control trials that would prove one medication works better than another or one psychotherapy works better than another. Then you'd bring a working group together, and they would look at all of these randomized control trials to determine which is the best. That's what they're trying to do.
There will be one study that perhaps is performed by a pharmaceutical company and may show one result, but what we're looking for is a meta-analysis in which you take a look at all of the studies related to that one therapy and see if on balance it's effective or not. That's what these committees do. They try to look at all of the randomized control trials, and that helps.
They do work by algorithms. They give different options.