The psychologist David Marks has written that parapsychologists have failed to produce a single repeatable demonstration of the paranormal and described psychical research as a pseudoscience, an "incoherent collection of belief systems steeped in fantasy, illusion and error." However, Chris French who is not convinced that parapsychology has demonstrated evidence for psi, has argued that parapsychological experiments still adhere to the scientific method, and should not be completely dismissed as pseudoscience. “Sceptics like myself will often point out that there’s been systematic research in parapsychology for well over a century, and so far the wider scientific community is not convinced." French has noted his position is "the minority view among critics of parapsychology".