M E C E  

(Mutually Exclusive Collectively Exhaustive) 

The MECE principle, pronounced "ME-see", is a grouping principle for separating a set of items into subsets that are mutually exclusive (ME) and collectively exhaustive (CE). It was developed in the late 1960s by Barbara Minto at McKinsey& Company and underlies her Minto Pyramid Principle, and is based on ideas going back as far as Aristotle. 

The MECE rule is valuable in the business planning measure wherein the ideal course of action of data is thorough and doesn't twofold check at any degree of the progressive system. Instances of MECE game plans incorporate classifying individuals by year of birth (accepting all years are known). A non-MECE model would be an arrangement by identity since ethnicities are neither totally unrelated (a few people have double ethnicity) nor all in all thorough

Mutually Exclusive: Main aim is to reduce complexity by avoiding overlaps. Making sure that all the possible solutions or groups are not accidentally considered more than once.  Proving exclusiveness forces you to carefully look at each option, 
Demonstrating selectiveness compels you to carefully take a gander at every choice, thus driving you to a lot further comprehension of the issue

Collectively Exhaustive: aims at an extensive assortment without leaving choices. Thorough implies that all potential alternatives have been thought of.  The trick is to divide a problem into categories with a finite number of general groups.