What are the different levels of testing defined in ISTQB?

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The International Software Testing Qualifications Board (ISTQB) defines four levels of testing, each with a specific focus and objective within the software development lifecycle. These levels help ensure that software is tested thoroughly from individual components to the entire system.

1. Unit Testing (Component Testing):
   This is the first level of testing and involves checking individual components or functions of a software application. Developers typically perform unit tests to ensure that each function or module works as intended. It focuses on inputs, outputs, and the internal logic of the code.

2. Integration Testing:
   This level tests the interaction between integrated components or systems. The goal is to identify issues in the interfaces and data flow between modules. Integration testing can be done in various approaches, such as top-down, bottom-up, or big bang.

3. System Testing:
   At this stage, the complete system is tested as a whole to verify that it meets the specified requirements. Testers validate both functional and non-functional aspects, including performance, security, and usability. System testing is usually done in a production-like environment.

4. Acceptance Testing:
   This is the final level, where the system is tested from the end-user’s perspective. It ensures the software meets business needs and is ready for deployment. Acceptance testing can be formal (like User Acceptance Testing, or UAT) and is typically performed by clients or stakeholders.

Each level builds on the previous one, helping catch defects early and ensure high-quality software delivery.

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