Mostert wrote in 2001, "FC proponents must be encouraged to subject their claims to further scientific verification, the claims of anecdotal evidence notwithstanding. If any small part of FC is ever to be found effective or even plausible, it is abundantly clear that only by careful use of controlled experimental methods will this be established." The only way to determine whether communications are truly independent is to perform controlled testing, where the facilitator does not already know the answers to questions and, therefore, cannot inadvertently or purposefully cue their communication partner to obtain the desired answer. Even if the facilitator feels like they are not moving the other person's hand, they can still be providing cues that lead to specific letters on the keyboard.