In Agile methodologies, which form the foundation of the CABA certification, the early and continuous involvement of testers is a core principle. This practice, often referred to as "shifting left," moves testing activities earlier in the lifecycle. Testers participate in requirements definition workshops (e.g., story refinement, backlog grooming) to ensure that requirements are clear, unambiguous, and, most importantly, testable. Their unique perspective helps identify edge cases, potential ambiguities, and missing acceptance criteria before any code is written. This collaborative approach, exemplified by the "Three Amigos" (BA, Developer, Tester), significantly reduces the cost of defects and improves the overall quality of the final product.

B. False: This reflects an outdated, traditional (Waterfall) model where testing is a distinct phase that occurs only after development is complete. This approach is contrary to Agile principles of collaboration and rapid feedback.

1. Agile Alliance & IIBA®, Agile Extension to the BABOK® Guide, Version 2, 2017.

Section 4.3.1, The Three Amigos: This section explicitly describes the collaborative approach where "representatives from the business, development, and testing... collaborate to ensure they have a shared understanding of the problem to be solved." This confirms the necessity of tester involvement during the requirements definition phase.

2. Adzic, G., Specification by Example: How Successful Teams Deliver the Right Software, Manning Publications, 2011.

Chapter 3, "Specifying Collaboratively": This chapter details the practice of collaborative workshops involving business users, developers, and testers to define requirements and specifications. It states, "With specification workshops, testers and programmers can clarify important details early... This avoids a lot of rework later." (p. 35).

3. Crispin, L., & Gregory, J., Agile Testing: A Practical Guide for Testers and Agile Teams, Addison-Wesley Professional, 2009.

Chapter 2, "A Whole-Team Approach": The authors emphasize that in Agile, "Testers participate in story-definition activities, asking questions that help expose missing requirements or unstated assumptions." (p. 27). This highlights the proactive role of testers in shaping requirements from the beginning.