<P> From its initial public announcement, Murphy's law quickly spread to various technical cultures connected to aerospace engineering . Before long, variants had passed into the popular imagination, changing as they went . </P> <P> Author Arthur Bloch has compiled a number of books full of corollaries to Murphy's law and variations thereof . The first of these was Murphy's law and other reasons why things go wrong!, </P> <P> Yhprum's law, where the name is spelled backwards, is "anything that can go right, will go right"--the optimistic application of Murphy's law in reverse . </P> <P> Peter Drucker, the management consultant, with a nod to Murphy, formulated "Drucker's Law" in dealing with complexity of management: "If one thing goes wrong, everything else will, and at the same time ." </P>

Working principle of shielding and murphy's law