What distinguishes a good tester from a bad one?

A good tester differs from a bad one primarily by their systematic approach and attention to detail. They do not just execute test cases but understand the business logic, can think from the user's perspective, and anticipate possible usage scenarios and errors.

Key differences:

• Active exploration of the product rather than mechanical execution of tests.
• Ability to properly prioritize bugs and identify critical issues.
• Good communication skills for interaction with developers and managers.
• Knowledge of automation tools and the ability to apply them to increase efficiency.
• Continuous learning and improvement of their skills.

A bad tester often limits themselves to formal task execution, does not try to understand the essence of the product, and does not analyze the causes of bugs.