According to the syllabus, a tester's ability to communicate about defects, test results, and other test information well is an important skill that contributes to testing effectiveness and efficiency. A tester should be able to communicate clearly, accurately, objectively, constructively, politely, and persuasively with various stakeholders involved in testing or affected by testing outcomes. A tester should also be able to use appropriate communication methods and tools depending on the context and purpose of communication. The answer A is correct because it is an example of a tester's ability to communicate about defects, test results, and other test information well. Emphasizing the benefits of testing means highlighting how testing adds value to the software product and the business goals. This can help to gain support and trust from stakeholders and foster a positive attitude towards testing. The other answers are incorrect because they are examples of poor communication skills that can hinder testing effectiveness and efficiency. Taking a command-and-control approach with the project team (B) means imposing one's own decisions or opinions without considering others' inputs or feedback. This can create conflicts and resentment among team members and reduce collaboration and cooperation. Being firm and assertive with test findings and information means insisting on one's own views or demands without being flexible or open-minded. This can lead to arguments and disagreements with stakeholders who may have different perspectives or expectations. Writing subjective defect reports and review findings (D) means using personal, biased, or unobservable information that does not support the evaluation or analysis of defects or tests. This can cause confusion and misunderstanding among stakeholders who may not be able to reproduce or verify the defects or tests.
References: Certified Tester Foundation Level Syllabus, Section 1.5.1, page 19-20.