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availability comparison table

Subject	indicate	cut	express in	measure	have	agree upon by	analysed	be	gather from	solve	is a kind of	is a subtopic of	express as	show as	describe	lead to	group with	restrict	give	change	has part	has definition	express using	over-constrain
measurement											subject	1.5 - Software Quality
non-functional requirement	how it will be implemented in order to give the designer as much freedom as possible to make decisions	if cost-benefit analysis shows that it will have minimum benefit but still cost a lot to develop	a natural language such as English (using present tense and active voice), sometimes supplemented by a formal mathematical language, and often by some form of diagram		benefits that outweigh the costs of development	all stakeholders	if there is any doubt whether it is realistic	verifiable by measuring various aspects of the system and seeing if the measurements conform with the requirement	various stakeholders, other software systems and any documentation that might be available	a customer's problem	requirement	4.5 - Types of Requirements	a fact	a diagram	a constraint that must be adhered to during development	a system of sufficient quality - one that is sufficiently usable, safe, efficient, reliable and maintainable	other requirements into a requirements document	the freedom of software engineers as they make design decisions because it limits what resources can be used and sets bounds on aspects of the software's quality	a unique number for traceability	whenever the benefits of doing so outweigh the costs	problem statement	A requirement that constrains design of a system, but does not describe a service that the system is to provide	clear and consistent notation, using language that the customers can understand, and consistent with the other requirements	the design of the system
availability	how it will be implemented in order to give the designer as much freedom as possible to make decisions	if cost-benefit analysis shows that it will have minimum benefit but still cost a lot to develop	a natural language such as English (using present tense and active voice), sometimes supplemented by a formal mathematical language, and often by some form of diagram	the amount of time that a server is running and available to respond to users	benefits that outweigh the costs of development	all stakeholders	if there is any doubt whether it is realistic	verifiable by measuring various aspects of the system and seeing if the measurements conform with the requirement	various stakeholders, other software systems and any documentation that might be available	a customer's problem	non-functional requirement	4.5 - Types of Requirements	a fact	a diagram	a constraint that must be adhered to during development	a system of sufficient quality - one that is sufficiently usable, safe, efficient, reliable and maintainable	other requirements into a requirements document	the freedom of software engineers as they make design decisions because it limits what resources can be used and sets bounds on aspects of the software's quality	a unique number for traceability	whenever the benefits of doing so outweigh the costs	problem statement	A quality that measures the amount of time that a system is running and able to provide services to its users	clear and consistent notation, using language that the customers can understand, and consistent with the other requirements	the design of the system

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