80/20 Rule - Pareto principle

80-20 Rules
80-20 Rules is also known as The Pareto principle (the law of the vital few, and the principle of factor sparsity) states that, for many events,
"roughly 80% of the effects come from 20% of the causes"

In Business:

80% of your profits come from 20% of your customers

80% of your complaints come from 20% of your customers

80% of your profits come from 20% of the time you spend

80% of your sales come from 20% of your products

80% of your sales are made by 20% of your sales staff

In Software:

Microsoft noted that by fixing the top 20% of the most reported bugs, 80% of the errors and crashes would be eliminated

Mathematical Note:

if 80% of effects come from the top 20% of sources, then the remaining 20% of effects come from the lower 80% of sources

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