When we can start Testing in SDLC

Testing in the Software Development Life Cycle (SDLC) is a crucial phase that helps identify defects early in the development process, ensuring a higher quality end product. Testing activities can start at different points in the SDLC, and the specific approach may vary based on the chosen development methodology (e.g., Waterfall, Agile). Here are common points in the SDLC where testing can begin:

Requirements Phase:
Testing Activities:
Static Testing: Review and analyze the requirements documentation to identify inconsistencies, ambiguities, and potential issues.
Objective: Ensure that the requirements are clear, complete, and testable.

Design Phase:
Testing Activities:
Static Testing: Review system architecture, design documents, and other design artifacts to identify potential issues.
Objective: Validate that the system design aligns with the specified requirements and is suitable for effective testing.

Construction or Coding Phase:

Testing Activities:
Unit Testing: Developers perform unit testing on individual components or modules to verify their correctness.
Objective: Ensure that each component works as intended in isolation.

Integration Phase:

Testing Activities:
Integration Testing: Verify that integrated components work together as expected.
Objective: Identify issues related to data flow, communication between components, and overall system integration.

System Testing Phase:
Testing Activities:
System Testing: Test the entire system to validate that it meets the specified requirements.
Acceptance Testing: Validate the system against user requirements, often involving end-users.
Objective: Confirm that the entire system functions correctly and satisfies user expectations.

Regression Testing:
Testing Activities:
Perform regression testing whenever there are code changes to ensure that existing functionalities remain unaffected.
Objective: Detect and address any unintended side effects of recent code changes.

User Acceptance Testing (UAT) Phase:
Testing Activities:
UAT: End-users or stakeholders perform testing to validate that the software meets business needs.
Objective: Ensure that the software is ready for production and meets user expectations.

It’s important to note that in Agile methodologies, testing is often integrated throughout the development process in an iterative and incremental manner. In Agile, testing activities may start as early as during the first sprint or iteration, with continuous testing and feedback loops throughout subsequent iterations. The goal is to identify and address defects as early as possible in the SDLC to minimize the cost and effort of fixing issues later in the development process.

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