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To restrain the problem from happening again, the project manager has instructed the quality team to concentrate on the top 20 percent of causes that resulted in the identified defect. This is an instance of:

A 80/20 rule

Specification limits and assignable cause are related to control charts and are therefore not the correct answers; trend analysis relates to run chart, also not the answer. That leaves the 80/20 rule, also known as Pareto’s Law or the Pareto Principle, which states that 80 percent of problems result from 20 percent of causes. This is exactly what the project manager in this scenario is looking for.