Six sigma traffic dating tips
Assuming 20% of the hazards account for 80% of the injuries, and by categorizing hazards, safety professionals can target those 20% of the hazards that cause 80% of the injuries or accidents.
Alternatively, if hazards are addressed in random order, a safety professional is more likely to fix one of the 80% of hazards that account only for some fraction of the remaining 20% of injuries.
The idea has a rule of thumb application in many places, but it is commonly misused.
For example, it is a misuse to state a solution to a problem "fits the 80/20 rule" just because it fits 80% of the cases; it must also be that the solution requires only 20% of the resources that would be needed to solve all cases.
Similarly for the bottom 80% of causes and bottom 20% of effects, the bottom 80% of the bottom 80% only cause 20% of the remaining 20%.
Many video rental shops reported in 1988 that 80% of revenue came from 20% of videotapes.
A video-chain executive discussed the "Gone with the Wind syndrome", however, in which every store had to offer classics like Gone with the Wind, Casablanca, or The African Queen to appear to have a large inventory, even if customers very rarely rented them.
Additionally, it is a misuse of the 80/20 rule to interpret a small number of categories or observations.
This is a special case of the wider phenomenon of Pareto distributions.Conversely, the hardest 20% of the code takes 80% of the time.