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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

differentiate between writing and jotting
Mmem Reply
configration management
Ravi Reply
what is a computer software
Chinaza Reply
Computer software is programming code executed on a computer processor at either the machine-level or the level of the operating system. ... The physical components of a computer are the hardware, and the digital programs running on the hardware are the software.
SATYAM
9292
Saeed
what is sofftware
Mohammed Reply
Software, in its most general sense, is a set of instructions or programs instructing a computer to do specific tasks. Software is a generic term used to describe computer programs. Scripts, applications, programs and a set of instructions are all terms often used to describe software.
SATYAM
now I got it
Ali
how to open a software company
SATYAM Reply
draw context model for a patient information system in a hospital
shruti Reply
how to activate Microsoft word
Matthew Reply
To activate Microsoft word, please follow these steps below: 1. On windows 8.1 or Windows 10, choose start. 2. Scroll down through your apps and choose Microsoft office- the tile with the Office logo. 3. In the windows that open, choose Activate. 4. Do one of the following:
Abdul
. If you are asked to sign in with your Microsoft account, that means you do not need a product key. proceed to the next step below and enter your Microsoft account. OR . If you are asked to enter a product key, this means a key was included with your purchase.
Abdul
Look for it on your Certificate of Authenticity or a card in the packaging. If you cannot find it, contact your reseller. The key uses a combination of 25 letters and numbers and looks this: xxxxx-xxxxx-xxxxx-xxxxx-xxxxx. Enter your key in the space provided. 5. Sign in with your Microsoft account
Abdul
to activate the Office product that came with your device.
Abdul
What can we do with cmd
Ibrahim Reply
cmd performs a lot of things that can perfomed in graphical method, generally interacting with files in the computer like deleting, writing, creating cmd can be used for networking purposes... mostly in network configurations, trying to view network setups etc.
Baraka
in programming....you can interact with your databases by using cmd.......so it performs a lot of things. good day.
Baraka
sir the basic questions is that what is cmd
Ali
what is software
Igho Reply
is set of instructions (generally referred to as code), that is positioned between you and the device hardware, enable you to use it .
Abdul
that's what a software can be defined as.
Abdul
Hi
Harinathreddy
what type of instructions
Ali
it may also concern to hardware or not
Ali
I'm just joining that depart could somebody plz define. ma about software engineering because I don't even know the how know of it
Ali
what is white box testing
MUNEIAH Reply
White Box Testing is a software testing method in which the internal structure/ design/ implementation of the item being tested is known to the tester.
khalil
What is software life cycle model? Why is it important during the development of a large softwre products
ramsahay Reply
explain About various types of software quality metrics
vijay Reply
I study software assignment course
Raza Reply
what is re process
naveen Reply
how to make software development projects
suresh Reply

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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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