Vilfredo Pareto – het Pareto principe

Vilfredo Pareto heeft in 1906 het Pareto principe opgesteld: een economische vaststelling dat 80% van de Italiaanse bezittingen eigendom waren van 20% van de bevolking.

Deze regel werd verder uitgepuurd door Joseph Juran, die ontdekte dat de 80/20 regel op zéér veel fronten toe te passen is.

  • 20% van de resterende project features hebben 80% van de project tijd nodig (!);
  • 80% van de bezoekers van een site, bezoeken 20% van de pagina’s op die site (welke 80% is maw minder waardevol?);
  • 80% van de winst van een bedrijf komt van 20% van zijn klanten;
  • 80% van de klachten bij customer service, komt van 20% van de klanten;
  • 80% van de omzet van een bedrijf, komt van 20% van de producten;

Een Pareto grafiek (“chart”) is een grafiek met zowel balken als lijnen, waarbij individuele waardes in omgekeerde volgorde (groot naar klein) voorgesteld worden door middel van balken. Het cumulatieve totaal wordt voorgesteld door een lijn. De linkse verticale as staat voor de frequentie, de rechtse verticale as staat voor het cumulatieve percentage van aantallen.


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