QUINT2

In the linked pages, indicators are given for each characteristic, from both ISO and QUINT origin. ISO indicators are not yet part of a standard, but can be found in document ISO/IEC JTC1/SC7 N1092 (working document for the technical report).

The use of this model is explained in the book "Kwaliteit van Softwareprodukten - Ervaringen met een kwaliteitsmodel" ("Quality of software products - Experiences with a quality model", in Dutch). The Extended ISO Model, as described here, can also be found on the floppy disk accompanying this book.

Functionality

A set of attributes that bear on the existence of a set of functions and their specified properties. The functions are those that satisfy stated or implied needs.

Sub characteristics

	Suitability
	Accuracy
	Interoperability
	Compliance
	Security
	Traceability

Reliability

A set of attributes that bear on the capability of software to maintain its level of performance under stated conditions for a stated period.

Sub characteristics

	Maturity
	Fault tolerance
	Recoverability
	Availability
	Degradability

Usability

A set of attributes that bear on the effort needed for use, and on the individual assessment of such use, by a stated or implied set of users.

Sub characteristics

	Understandability
	Learnability
	Operability
	Explicitness
	Customisability
	Attractivity
	Clarity
	Helpfulness
	User-friendliness

Efficiency

A set of attributes that bear on the relationship between the level of performance of the software and the amount of resources used, under stated conditions.

Sub characteristics

	Time behaviour
	Resource behaviour

Maintainability

A set of attributes that bear on the effort needed to make specified modifications.

Sub characteristics

	Analysability
	Changeability
	Stability
	Testability
	Manageability
	Reusability

Portability

A set of attributes that bear on the ability of software to be transferred from one environment to another.

Sub characteristics

	Adaptability
	Installability
	Conformance
	Replaceability