According to [[Karl Popper]], a noted authority on scientific methodology, whenever a [[hypothesis]] appears to a [[scientist]] as the only possible one, it should be taken as a sign that he or she have neither understood the hypothesis nor the problem which it was intended to solve. He also urges investigators to construct ''alternative'' theories - althernatives even to those theories which appear to one inescapable. Only in that way the theories held could be understood.<ref name="Hedtke">{{cite book | According to [[Karl Popper]], a noted authority on scientific methodology, whenever a [[hypothesis]] appears to a [[scientist]] as the only possible one, it should be taken as a sign that he or she have neither understood the hypothesis nor the problem which it was intended to solve. He also urges investigators to construct ''alternative'' theories - althernatives even to those theories which appear to one inescapable. Only in that way the theories held could be understood.<ref name="Hedtke">{{cite book |