The McKinsey Way: Using the Techniques of the World's Top Strategic Consultants to Help You and Your Business

you think you have determined the issues, take a hard look at them. Is each one a separate and distinct issue? If so, then your issue list is mutually exclusive

MECE (pronounced “me-see”) stands for “mutually exclusive, collectively exhaustive”

Why don’t you ride down in the elevator with me and tell me what you’ve found out?” The ride will take about 30 seconds. In that time, can you tell the CEO your solution?
Can you sell him your solution? That’s the elevator test