Roll of a Tester in different phase of SDLC

Requirement Phase:
The testing process should begin early stage in application development cycle.

Testers need a solid understanding of the product so they can devise better and more complete test plans, designs, procedures, and cases. Early test-team involvement can eliminate confusion about functional behavior later in the project life cycle. In addition, early involvement allows the test team to learn over time which aspects of the application are the most critical to the end user and which are the highest-risk elements. This knowledge enables testers to focus on the most important critical and high priority part of application.

During the requirement phases of SDLC. the business requirements are defined on high level. During this phase a tester can come up with document testing approach to verify its quality, completeness, and correctness, can point out contradictory requirements.

More systematically, during the requirement phase, a tester can build a Acceptance Test Plan There are some formal approaches and documents which can be created during this phase. Such as:

Inspection/ Walkthrough:

System/Acceptance Test Plan:

Checklist:

Requirement Checklist:

Logical and Physical design..

Business requirment are defined during the requirment phase. It is followd by logical design and refines requirement. Logical design is an abstract, and it is conceptual not physical.

Logical design is al about detail system framework and Logical architecture is the manner in which logical components of a solution are organized and integrated. The Architectural Design phase, where a software architecture for thei mplementation of the requirements is designed and specified, identifying the components within the software and the relationships between the components.

Physical Design describes how an information system will be physically implemented in order to meet its logical requirements. This involves specifying the technical (hardware and software) components that will enable the logical design specifications to be implemented.

The logical design phase is verified with static techniques. for example one module may need a particular data created by another module is not provided correctly. Static anlaysis can be applied to detect these types of control flow errors.

Integration test cases is a good approach to test it and determine whether all components interface properly, parameters are passed, and the file processing is correct. It doesnot verify that functionality is correct, only it perfrm as it is designed,