While being generic, the following skills are particularly relevant for testers:
• Testing knowledge (to increase effectiveness of testing, e.g., by using test techniques)
• Thoroughness, carefulness, curiosity, attention to details, being methodical (to identify defects, especially the ones that are difficult to find)
• Good communication skills, active listening, being a team player (to interact effectively with all stakeholders, to convey information to others, to be understood, and to report and discuss defects)
• Analytical thinking, critical thinking, creativity (to increase effectiveness of testing)
• Technical knowledge (to increase efficiency of testing, e.g., by using appropriate test tools)
• Domain knowledge (to be able to understand and to communicate with end users/business representatives)
Testers are often the bearers of bad news. It is a common human trait to blame the bearer of bad news.

This makes communication skills crucial for testers. Communicating test results may be perceived as criticism of the product and of its author. Confirmation bias can make it difficult to accept information that
disagrees with currently held beliefs. Some people may perceive testing as a destructive activity, even though it contributes greatly to project success and product quality. To try to improve this view, information
about defects and failures should be communicated in a constructive way.