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Pareto principle: 80-20 rules
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1. Pareto principle: 80-20 rules
The Pareto chart is named after Vilfredo Pareto, 1848-1923, an Italian economist.

2. Pareto principle: 80-20 rules
Pie chart for 80-20 ruleVilfredo Pareto (1848-1923) made the observation that 20% of the population owned 80% of the wealth.

This idea has been called Pareto's principle and has been applied in many other areas.

3. Pareto chart
Pareto chartA Pareto chart is a combination chart that shows an individual count or frequency using a column bar chart, ordered in decreasing order from left to right, and a cumulative distribution using a line chart.

4. Software engineering
A principle in software engineering is that 80% of the functionality can be accomplished with 20% of the overall effort but the remaining 20% of the functionality (which may be very important) will take 80% of the effort.

This is why many projects start up appearing to be making very good progress but then get bogged down in details.

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