<P> The commission passed off the evaluation to Pfungst, who tested the basis for these claimed abilities by: </P> <Ol> <Li> Isolating horse and questioner from spectators, so no cues could come from them </Li> <Li> Using questioners other than the horse's master </Li> <Li> By means of blinders, varying whether the horse could see the questioner </Li> <Li> Varying whether the questioner knew the answer to the question in advance . </Li> </Ol> <Li> Isolating horse and questioner from spectators, so no cues could come from them </Li> <Li> Using questioners other than the horse's master </Li>

Clever hans could answer a question correctly only if he