# Norm

Etymology: the word**norm**comes from the latin word

*norma*which means "angle measure" or (lawlike) "rule".

In sociology, a **norm** is an expected pattern of behavior in a given situation, the custom. In matters of the mind, one who has common sense is following the norm, is normal. In matters of behavior one who follows the norms of society is a regular guy or a right guy. One who does not is considered eccentric. Important norms are called mores. Violations of mores are punished with severe sanctions.

In social situations (e.g. meetings), **norms** are unwritten (and often unstated) *operating rules* that govern people's behavior resulting in a smooth interpersonal meshing. Norms are most evident when they are not followed or are broken. This is often experienced when an individual finds him/herself in a foreign country, dealing with a strange culture where the norms are different.

In some groups, norms are consciously prescribed as a set of ground rules.

Persons skilled in facilitation assist groups in recognizing norms, as well as establishing norms to promote greater group (or team) effectiveness.

*See also*: normative

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In mathematics, a **norm** can be any of several things in mathematical analysis and abstract algebra. These include:

- a map which assigns a length to vectorss. Such a vector need not be in physical space; see normed vector space; in particular, in matrix theory, a norm can be a matrix norm such as the
*induced norm*,*spectral norm*, or*Frobenius norm*. - the nonnegative integer function in the definition of Euclidean domain;
- the product of conjugate elements of an algebraic element;
- the field norm from algebraic number theory and Galois theory that is a power of the previous definition;
- the reduced norm in the theory of algebrass.

In psychometrics a norm is a statistical characteristic of a sample used for purposes of comparison. For example, a student's score on a standardized test of academic achievement may be expressed as the percentile rank of that score in a norm group intended to be representative of the population of students.