Believers and skeptics both point to experiments that succeeded or failed to support their respective point of view. It is important, however, when considering the possibility of psi to consider the whole and not just one example when attempting to prove a position. Hans J. Eysenck and Carl Sargent write in their book Explaining the Unexplained,

It would be wrong to think that such "demonstrations" are necessarily the best evidence for psi. They are only part of the picture. What we really need are groups of experiments, reported by different researchers, that show consistent patterns of evidence. Then the accumulation of results-none of which need be overly dramatic taken in isolation-would form a persuasive overall picture. This is a "bundle of sticks" argument. Taken individually, the sticks (individual experiments) may be easy to break. Bound together (considered as groups of related experiments), they...