text: how is the law of parsimony implemented in everyday life.? how do we use it, and why? in science, parsimony is preference for the least complex explanation for an observation. this is generally regarded as good when judging hypotheses. occam's razor also states the "principle of parsimony".  we do that everyday in judging causes of events. we start with the most simple likely cause of an event and only move to more complex explanations when we can rule out the more simple explanation.