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System testing simulates how the end customer is going to use the application in real life – logical steps from beginning to end. Is the performance of the application affected negatively by its elements in any manner possible? Can it handle unfavorable conditions and keep functioning at a certain level of effectiveness?

  • It deals with the verification of the high and low-level software requirements specified in the Software Requirements Specification/Data and the Software Design Document.
  • System and software requirements specifications (functional and non-functional) – SRS gives complete requirements on how the integrated System should work.
  • The strategy is to involve the testing team from the start, so they have a complete understanding of the System.
  • In a usability test, actual users try to get typical goals and tasks with a product under controlled conditions.
  • A professional testing agent performs system testing on the completed software product before it is released to the market.
  • A single API can have multiple implementations in the form of different libraries that share the same programming interface.

Usability testing is mainly used for the design of the application. This testing determines whether operations can be continued after a disaster or after the integrity of the system has been lost. The cost of testing will be high because it includes testing the entire software. Migration testing ensures that software can be moved from older to current system infrastructures. Verify thorough testing of every input in the application to check for desired outputs.


System Testing is carried out on the whole system in the context of either system requirement specifications or functional requirement specifications or in the context of both. System testing tests the design and behavior of the system and also the expectations of the customer. It is performed to test the system beyond the bounds mentioned in the software requirements specification .

It will test the entire product or software, allowing us to easily detect errors or defects that were missed during the unit and integration testing. Regression Testing entails testing to ensure that no changes made during the development process have resulted in new bugs. It also ensures that no old bugs emerge due to adding new software modules over time.

definition of system testing

Security, recovery, maintainability, external interface, certification requirements, and complex functionality assessment are the main focus. System security, which includes data encryption and network attack protection that satisfy expected requirements. Parallel testing is to determine – New version of an application or new system performs correctly with the reference to the existing system that working correctly. In smoke testing, all components should be touched, and every major feature should be tested briefly.

Migration Testing – Testing of programs used to migrate /convert data from one application to another replacement application. Drivers are removed, and clusters are combined moving upward in the program structure. Delay many tests until stubs are replaced with actual modules. To make sure that new errors have not been introduced Regression Testing may be performed.

Difference between System Testing vs Integration Testing

Epics and user stories – Epics and user stories will give a high-level view of the System. A combination of them creates an end to end system test cases. System testing aims to build confidence in the quality of the system as a whole. And all this test effort is called System Testing, which verifies the car on every aspect.

Capability testing is more useful in web-based applications where we can check that application must be accessible from every browser. The purpose of security testing is to determine, how well a system protects against unauthorized internal or external access or willful damage. Education for Software Testers- There is a distinct learning curve for each type of software testing available. A tester must learn how to use some of the software involved. Load testing is required to ensure that a software solution will perform under real-world loads. The types that a large software development company would typically use are listed below.

There are obviously specific signs for many words available in sign language that are more appropriate for daily usage. Here I am going to provide frequently used types of system testing. Inserting SIM Card in your iPhone XE allows you to do Integration testing whereas testing the calling feature after inserting the SIM Card allows you to perform System Testing. It is performed by the Test definition of system testing Team that is independent of the Dev Team. DisclaimerAll content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.

Low-level modules are combined into clusters that perform a specific software sub-function. Incremental integration is the contrast to the big bang approach. The program is constructed and tested in small segments, where errors are easier to isolate and correct.


Ultimately, the software is interfaced with other software/hardware systems. System Testing is defined as a series of different tests whose sole purpose is to exercise the full computer-based system. First of all, the design of programming interfaces represents an important part of software architecture, the organization of a complex piece of software. One straightforward and commonly adopted way of designing APIs is to follow Nielsen’s heuristic evaluation guidelines.

definition of system testing

In this process, the modules are integrated from the bottom to the top. Large software developments will divide software integration into a number of levels. The lower levels of software integration could be based predominantly in the host environment,with later levels of software integration becoming more dependent on the target environment. Resources available to the tester – Some testers will lack the necessary resources to conduct a particular type of testing. For example, work as a tester for a large software development firm. You will likely have access to expensive automated testing software that others do not.

Scalability Testing − To ensure that the system can scale in terms such as user scaling, geographic scaling, and resource scaling. Interoperability Testing − To determine whether or not the system is compatible with third-party goods. At this level of the STLC, both the Application Architecture and the Business Requirements are tested.

Bottom-up Approach

It is carried out to confirm all system elements behave as intended and all functions are achieved. System testing goes after integration testing as the last step before handing the software over to a user for acceptance testing. It is mainly a black box technique or sometimes a mix of white box and black box techniques. The scope of system testing is not only limited to the design of the system but also to the behavior and believed expectations of the business. In accordance with the software test cycle, system testing is performed before acceptance testing and after integration testing. Independent users or testers are given the tasks to perform in the system testing phase.

definition of system testing

When tested, the observed behaviour of a component or system is the result of system test. After this testing, the product will almost cover all the possible bugs or errors and hence the development team will confidently go ahead with acceptance testing. The testing environment is similar to that of the real time production or business environment. Integration testing done before, during and after integration of a new module into the main software package. One piece of software can contain several modules which are often created by several different programmers.

Independent testers often do System testing to have an objective view of the System. The strategy is to involve the testing team from the start, so they have a complete understanding of the System. System test scenarios are usually end-to-end tests that can cover the full System. Architects and product owners usually review these scenarios.

Personal tools

Testing the fully integrated applications including external peripherals in order to check how components interact with one another and with the system as a whole. Checking the installation − The purpose of installation testing is to ensure that the program is installed correctly. The installation of the program is the user’s first engagement with the product, hence it’s the most crucial phase of testing. The sort of installation testing required is determined by a number of elements, including the operating system, platform, software distribution, and so on. All of the modules/components are linked together to see whether the system performs as planned.

How to say system testing in sign language?

The test basis is the source of information or the document, which is the main requirement for writing test cases and also for test analysis. The base of the test must be well defined and adequately structured so that one can quickly identify the test conditions from which the test cases are derived. System Testing results are used by stakeholders to make release decisions. The Entry criteria for User Acceptance testing is the basis completion of System Testing.

Environment, while simulating the entire system [other CSC’s], and on the high-level functionality. Make sure your application’s UI logic works for all categories of users. Since all functions combined as one entity should be covered with tests, system testing requires more time and dedication.

System testing seeks to detect defects both within the “inter-assemblages” and also within the system as a whole. System testing tests not only the design, but also the behaviour and even the believed expectations of the customer. It is also intended to test up to and beyond the bounds defined in the software or hardware requirements specification. System testing is performed on the entire system in the context of either system requirement specifications, functional requirement specifications, or both.