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The MECE principle, (mutually exclusive and collectively exhaustive) is a grouping principle for separating a set of items into subsets that are mutually exclusive (ME) and collectively exhaustive (CE). [1] It was developed in the late 1960s by Barbara Minto at McKinsey & Company and underlies her Minto Pyramid Principle, [2] and while she takes credit for MECE, according to her interview with McKinsey, she says the idea for MECE goes back as far as to Aristotle. [2]
The MECE principle has been used in the business mapping process wherein the optimum arrangement of information is exhaustive and does not double count at any level of the hierarchy. Examples of MECE arrangements include categorizing people by year of birth (assuming all years are known), apartments by their building number, letters by postmark, and dice rolls. A non-MECE example would be categorization by nationality, because nationalities are neither mutually exclusive (some people have dual nationality) nor collectively exhaustive (some people have none).
Strategy consultants use MECE problem structuring to break down client problems into logical, clean buckets of analysis that they can then hand out as work streams to consulting staff on the project.
Similarly, MECE can be used in technical problem solving and communication. In some technical projects, like Six Sigma projects, the most effective method of communication is not the same as the problem solving process. In Six Sigma, the DMAIC process is used, but executive audiences looking for a summary or overview may not be interested in the details. By reorganizing the information using MECE and the related SCQA storytelling framework, the point of the topic can be addressed quickly and supported with appropriate detail. The aim is more effective communication. [3]
The MECE concept has been criticized for not being exhaustive, as it doesn't exclude superfluous/extraneous items. [4]
Also, MECE thinking can be too limiting as mutual exclusiveness is not necessarily desirable. For instance, while it may be desirable to classify the answers to a question in a MECE framework so as to consider all of them exactly once, forcing the answers themselves to be MECE can be unnecessarily limiting. [5]
Another attribute of MECE thinking is that, by definition, it precludes redundancies. However, there are cases where redundancies are desirable or even necessary. [6]
There is some debate regarding the pronunciation of the acronym MECE. Although it is pronounced by many as /ˈmiːsi/ , [7] the author insisted that it should be pronounced as /miːs/ . [2]
Categorization is a type of cognition involving conceptual differentiation between characteristics of conscious experience, such as objects, events, or ideas. It involves the abstraction and differentiation of aspects of experience by sorting and distinguishing between groupings, through classification or typification on the basis of traits, features, similarities or other criteria that are universal to the group. Categorization is considered one of the most fundamental cognitive abilities, and it is studied particularly by psychology and cognitive linguistics.
In traditional logic, a contradiction occurs when a proposition conflicts either with itself or established fact. It is often used as a tool to detect disingenuous beliefs and bias. Illustrating a general tendency in applied logic, Aristotle's law of noncontradiction states that "It is impossible that the same thing can at the same time both belong and not belong to the same object and in the same respect."
In mathematics, a partition of a set is a grouping of its elements into non-empty subsets, in such a way that every element is included in exactly one subset.
A dichotomy is a partition of a whole into two parts (subsets). In other words, this couple of parts must be
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In probability theory and logic, a set of events is jointly or collectively exhaustive if at least one of the events must occur. For example, when rolling a six-sided die, the events 1, 2, 3, 4, 5, and 6 balls of a single outcome are collectively exhaustive, because they encompass the entire range of possible outcomes.
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The sociology of human consciousness or the sociology of consciousness uses the theories and methodology of sociology to explore and examine consciousness.
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Barbara Minto is an American author and consultant focused on the subject of executive communication.