Some Definitions related to Quality

quality | characteristic | requirement | management | quality management | quality control | quality assurance

quality
degree to which a set of inherent characteristics fulfils requirements

NOTE 1 The term quality can be used with adjectives such as poor, good or excellent.

NOTE 2 "Inherent" as opposed to "assigned", means existing in something, especially as a permanent characteristic.

characteristics
distinguishing feature

NOTE 1 A characteristic can be inherent or assigned.

NOTE 2 A characteristic can be qualitative or quantitative

There are various classes of the characteristic, such as the following:

physical (e.g. mechanical, electrical, chemical or biological characteristics);
sensory (e.g. related to smell, touch, taste, sight, hearing);
behavioral (e.g. courtesy, honesty, veracity);
temporal (e.g. punctuality, reliability, availability);
ergonomic (e.g. physiological characteristic, or related to human safety);
functional (e.g. maximum speed of an aircraft).

requirement
need or expectation that is stated, generally implied or obligatory

NOTE 1 "Generally implied" means that it is custom or common practice for the organization, its customers and other interested parties, that the need or expectation under consideration is implied.

NOTE 2 A qualifier can be used to denote a specific type of requirement, e.g. product requirement, quality management requirement, customer requirement.

NOTE 3 A specified requirement is one which is stated, for example, in a document.

NOTE 4 Requirements can be generated by different interested parties

management
coordinated activities to direct and control an organization

quality management
coordinated activities to direct and control an organization with regard to quality

NOTE: Direction and control with regard to quality generally includes establishment of the quality policy and quality objectives, quality planning, quality control, quality assurance and quality improvement.

quality control
part of quality management focused on fulfilling quality requirements

quality assurance
part of quality management focused on providing confidence that quality requirements will be fulfilled.

Reference:

ISO 9000:2000 'Quality Management Systems - Fundamentals and Vocabulary (Second Revision)'

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