Understanding Variation af Donald J. Wheeler (Bog)
The Key to Managing Chaos“Businessmen are finding that while they have more numbers than ever before, they still do not know what these numbers mean.”“This book was written to help organizations overcome the effects of numerical naivete.”Understanding Variation is a classic in understanding and measuring how businesses work. Its key lesson is that things vary. When we see that trade is down in February compared to last year, it’s tempting to assume that means something. The media will certainly report it as such, but we really don’t have any reason to do so. For that data to be meaningful would require that last year be ‘normal.’ I’m not sure that’s ever happened.Variation is a significant challenge for businesses. If a business has bad results one month, should it make changes? Wait? Ignore it? There are no hard and fast rules, though entire disciplines have arisen over what type of results mean something (see: Six Sigma). Even good managers fall victim to regression to the mean: when they see results that are worse than average, they reprimand the employee, and things get better! Of course, when they see good results, they reward the employee, and things get worse. Managers learn to always be mean, rather than the true lesson that things can’t permanently stay above or below average.Wheeler presents a few key rules, including that no data have meaning apart from their context, and that to detect a signal, filter out the noise. Much of the book, however, focuses on laying out tools that can help businesses identify meaningful variation. Wheeler swears by the control or XmR chart, a time series combined with a graph showing the size of the change each period. It means you can track both level and variability simultaneously, and look for significant changes in either.Forlag: S P C PressUdgivelsesår: 2000Sider: 158Sprog: Engelsk Klik på 'Se annoncen hos forhandleren' for at se varen i vores webshop Vi sender til hele landet for 45 kr. Leveringstiden er 1-3 hverdage. Du kan også gratis hente den på vores lager på Industrivej 10 i Slangerup. Er du i tvivl om varen stadig er til salg? Klik på knappen "Se annoncen hos forhandleren" for at se den i vores webshop. Kan du se den der, er den stadig til salg. Orderly er en ny måde at købe brugt på. Vi har alle vores sælgeres ting på vores centrale lager. Derfor kan du være helt sikker på at få dine ting - og du kan samle flere ting på tværs af sælgere og kun betale én gang fragt.
