Grey Box Testing combines elements of black-box and white-box testing approaches. Testers have partial knowledge of the internal workings or code of the software being tested.
Characteristics:
1. Partial access to internal code or structure
2. Combines functional and structural testing
3. Balances internal knowledge with external perspectives
4. Focuses on specific components or modules
5. Often used for integration testing
Benefits:
1. More efficient test case design
2. Better coverage of critical paths
3. Improved error detection
4. Balances thoroughness and efficiency
5. Helps identify design flaws
Grey box testing is useful when testers need some internal knowledge to create effective tests but don’t require full access to the source code.