For the benefit of the many lets elaborate on A clear misuse of Jurans assumption    In manufacturing systems are designed so that everybody contributes a predefined amount of work especially in synchronous settings such as assembly lines Nobody could argue for a Pareto distribution there   In agriculture and mining individual contributions are sometimes measurable eg basketful of apples picked per person per shift A forprofit organization seeks out good workers so the bottom part of the distribution will not be represented at all Family and community operations often find a way to gainfully employ persons with less strength eg yearold girls or with disabilities eg blind people but their number is not large enough to warrant a Pareto distribution   Which brings us to the only economic system many readers have experience of The services sector In it there is a place for stars in fields like moviemaking and advertising where moneymaking ability is so narrowly distributed that it can sustain not just an  modeling but  and even  think of the distribution of pay in the fashion modeling world   In other service areas such as software development it has been argued and many influential minds such as Frederick Brooks and Joel Spolsky have devised methods for measuring and quantifying this that a top designer programmer or QA person is roughly ten times as effective  as an average one  It can be agued that this observation distribution does not carry to other areas of computing such as system administration   Finally the difference between top waiters or shoe salespeople and average ones may not warrant any Pareto analysis