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Testing is the process of evaluating a system or its component(s) with the intent to find whether it satisfies the specified requirements or not.In simple words, testing is executing a system in order to identify any gaps, errors, or missing requirements in contrary to the actual requirements.According to ANSI/IEEE 1059 standard, Testing can be defined as - A process of analyzing a software item to detect the differences between existing and required conditions (that is defects/errors/bugs) and to evaluate the features of the software item.It depends on the process and the associated stakeholders of the project(s).In the IT industry, large companies have a team with responsibilities to evaluate the developed software in context of the given requirements.

An early start to testing reduces the cost and time to rework and produce error-free software that is delivered to the client.However in Software Development Life Cycle (SDLC), testing can be started from the Requirements Gathering phase and continued till the deployment of the software.It also depends on the development model that is being used.For example, in the Waterfall model, formal testing is conducted in the testing phase; but in the incremental model, testing is performed at the end of every increment/iteration and the whole application is tested at the end.

Testing is done in different forms at every phase of SDLC: It is difficult to determine when to stop testing, as testing is a never-ending process and no one can claim that a software is 100% tested.

The following aspects are to be considered for stopping the testing process: These two terms are very confusing for most people, who use them interchangeably. Verification Validation 1 Verification addresses the concern: "Are you building it right?