Weiss and Vasquez demonstrated the importance of trying different protocols. Frequently researchers conducted tests in unfamiliar settings. Occasionally researchers drew conclusions that contradict their own data. In one case ambiguous data appearing in an original report was deleted from the published version. In many ways, both subtle and overt, researchers fundamentally changed the phenomenon that they were trying to measure.
Examples are too numerous and too complex to begin to describe here.
In attempting to control the experimental conditions they stopped doing facilitated communication. Facilitator training was usually inadequate or not described. Participants usually had been using FC for a very short period of time. The criticism of FC has not always been fair but it has not been completely unjustified. Many people do facilitated communication poorly.