Recognizing that most defects are often concentrated in a small number of modules. Testing is Context-Dependent:

Regularly updating test cases to prevent them from losing their effectiveness at finding new bugs over time. ResearchGate Testing Techniques

Initiating testing activities as soon as requirements are defined to reduce the cost of later rework. Defect Clustering:

The text emphasizes fundamental software testing principles that guide decision-making throughout the lifecycle: Early Testing:

The textbook Software Testing: Principles, Techniques and Tools

Acknowledging that different software types (e.g., security-critical vs. e-commerce) require distinct testing approaches. Pesticide Paradox: