EF

1	2	3	4	5	6	7
A	B	C	D	E	F	G
H	I	J	K	L	M	N
O	P	Q	R	S	T	U
V	W	X	Y	Z
EA	EB	EC	ED	EE	EF	EG
EH	EI	EJ	EK	EL	EM	EN
EO	EP	EQ	ER	ES	ET	EU
EV	EW	EX	EY	EZ

Effectiveness

• accuracy and completeness with which users achieve specified goals [1, Sec. 3.1347][2, Sec. 4.2]
• extent to which planned activities are realized and planned results achieved [3, Sec. 3.1.3]
• relation of the goals of using the product to the accuracy and completeness with which these goals might be achieved [4, Sec. 3.14]

  Eg:

• For documentation, common measures include percentage of task completion, frequency of defects, frequency of assists, frequency of accesses to help or documentation.

  Attribute of

• Usability

Efficiency

• degree to which a system or component performs its designated functions with minimum consumption of resources
• resources expended in relation to the accuracy and completeness with which users achieve goals [1, Sec. 3.1349][2, Sec. 4.3]
• relation of the level of effectiveness achieved to the quantity of resources expended [1, Sec. 3.1349][4, Sec. 3.15]
• relationship between the result achieved and the resources used [5, Sec. 4.17]

  Attribute of

• Usability

References

[1] “ISO/IEC/IEEE International Standard - Systems and software engineering–Vocabulary,” in ISO/IEC/IEEE 24765:2017(E) , vol., no., pp.1-541, 28 Aug. 2017, doi: 10.1109/IEEESTD.2017.8016712.

[2] ISO/IEC 25062:2006 Software engineering — Software product Quality Requirements and Evaluation (SQuaRE) — Common Industry Format (CIF) for usability test reports

[3] ISO/IEC 33001:2015 Information technology — Process assessment — Concepts and terminology

[4] ISO/IEC 26513:2009 Systems and software engineering — Requirements for testers and reviewers of user documentation

[5] ISO/IEC 16350-2015 Information technology — Systems and software engineering — Application management