Most testers test control (paths). Beizer argued that testing data is harder and more important. He introduced the concept of , often notated as:

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Boris Beizer famously argued that . His work shifted the perspective of testing from a post-development "bug hunt" to a rigorous engineering discipline that starts during the design phase. Key Techniques and Methodologies

You might be thinking: "This book was written before Google existed. Why should I read it?"