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System testing

System testing is concerned with the behavior of a whole system. The majority of functional failures should already have been identified during unit and integration testing. System testing is usually considered appropriate for comparing the system to the non-functional system requirements, such as security, speed, accuracy, and reliability. External interfaces to other applications, utilities, hardware devices, or the operating environment are also evaluated at this level.

Objectives of testing

Testing is conducted in view of a specific objective, which is stated more or less explicitly, and with varying degrees of precision. Stating the objective in precise, quantitative terms allows control to be established over the test process.

Testing can be aimed at verifying different properties. Test cases can be designed to check that the functional specifications are correctly implemented, which is variously referred to in the literature as conformance testing, correctness testing, or functional testing. However, several other nonfunctional properties may be tested as well, including performance, reliability, and usability, among many others.

Other important objectives for testing include (but are not limited to) reliability measurement, usability evaluation, and acceptance, for which different approaches would be taken. Note that the test objective varies with the test target; in general, different purposes being addressed at a different level of testing.

References recommended above for this topic describe the set of potential test objectives. The sub-topics listed below are those most often cited in the literature. Note that some kinds of testing are more appropriate for custom-made software packages, installation testing, for example; and others for generic products, like beta testing.

Qualification testing

Qualification testing checks the system behavior against the customer’s requirements, however these may have been expressed; the customers undertake, or specify, typical tasks to check that their requirements have been met or that the organization has identified these for the target market for the software. This testing activity may or may not involve the developers of the system.

Installation testing

Usually after completion of software and acceptance testing, the software can be verified upon installation in the target environment. Installation testing can be viewed as system testing conducted once again according to hardware configuration requirements. Installation procedures may also be verified.

Alpha and beta testing

Before the software is released, it is sometimes given to a small, representative set of potential users for trial use, either in-house (alpha testing) or external (beta testing). These users report problems with the product. Alpha and beta use is often uncontrolled, and is not always referred to in a test plan.

Reliability achievement and evaluation

In helping to identify faults, testing is a means to improve reliability. By contrast, by randomly generating test cases according to the operational profile, statistical measures of reliability can be derived. Using reliability growth models, both objectives can be pursued together.

Questions & Answers

Which SDLC Model will you select to develop the system as a software engineer and why?
Subrato Reply
communication techniques in software development
SANJANA Reply
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Aslam
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Subrato
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Marvin Reply
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Mark Reply
Kashmir
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Anil
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Rohid
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Rohid
Which of these are standards for assessing software processes
own Reply
hello teacher may I give me example of format of software
Aurianne
team a found 342 errors during the software engineering process prior to release. team b found 184 errors. what additional measures would have to be made for projects a and b to determine which of the teams eliminated errors more efficiently? what metrics would you propose to help in making the determination? what historical data might be useful?
Kaviya Reply
it's depend upon software testing and debugging
OMKAR
Hi, Everyone
Rohid
what is coding
Waswa Reply
programming languages is a coding it is also used software development, designing, modeling, etc..
OMKAR
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Ichaba
AND here lot of course
OMKAR
How to calculate the basic salary of a payroll in Java coding?
Adjei Reply
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Parvez
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Bahadur
but we have tobe serious in k.dge.. what is the meaning of java coding if you are gineous you will answer me
Eyiba
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Mark
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Rana
Quids on software engineering
Enongene Reply
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Prerana
Ho
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definition of software
Baba Reply
define system ,concepts of system and types of system?
Gurmeet Reply
iom
ADNAN
hello
arsh
hari Paulus hai
Hari
System is the way of Execution or a set of principles to do something or any task is called System.
Ayesha
There are many infinite forms and Types of System in different fields as well.
Ayesha
TELL ME ABOUT MAINFRAME?
OMKAR
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Md
System is the way of Execution or a set of principles to do something or any task is called System.
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arsh
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Ravindra Reply
Software engineering is a detailed study of engineering to the design, development and maintenance of software
arsh
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Akash Reply
it depend on organization's and quality
josephat
I think average salary 80000us dollars per year
arsh
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Source:  OpenStax, Software engineering. OpenStax CNX. Jul 29, 2009 Download for free at http://cnx.org/content/col10790/1.1
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