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Checking of how easily it is to maintain a system is the main aim of this testing type. The system or application support involves analysis, modification, and testing the product.

Nowadays, independent testing becomes more and more popular. And it is really true, performing testing of mobile apps and systems, the specialists that are not connected with the project team can significantly increase the development efficiency.

There are several levels of ‘independence’ in software product testing. Generally, four such levels are singled out.

While stress testing brings the system up to its functional boundary; endurance testing is focused on the applications limitations caused after its continuous usage.

Performing endurance testing, the specialists check the range of specific aspects of the system that are connected with its potential capacities.

Endurance testing (checking of activity flow) is one of performance testing types. This is the checking of the load level that the product is able to withstand within a particular time.

According to incremental model, the product creation process is divided into diverse builds. Thus, development cycle reminds “multistage” model.

The RAD (Rapid Application Development) development model is one of the types of incremental model. The principle of parallel creation of the system components and functions underlies this model.

To define and estimate the maturity level of the company as for the development process, the special model of “technical maturity” - Capability Maturity Model - is used.

Generally, regression testing is performed in order to assure that current functionality operates appropriately, and all code modifications did not break the work of other systems.