Reddit reviews Reliability and Validity in Qualitative Research (Qualitative Research Methods)

The point is that their performance is being assessed based on a number of bugs. They want to be perceived as performing well. It's important to remember that this is only /partly/ about how testers will respond to being measured like that. The other part is about how flawed measures like this are. Like /u/tech_tuna mentioned, the most senior folks end up spending a lot of time working with other people which means they are reporting far fewer bugs. According to your method, this would mean they are not performing well.

Read this book if you want to learn more about measurement.

I am really not a fan of assessing performance via measurement, that usually means management is divorced from the work to the extent that someone has to measure it so they can make interpretations. I like it when management is there to facilitate.

Questions like this can help though:

• Is the tester providing useful information to developers
  
• Is the tester providing useful information to people that make ship decisions
  
• Is the tester finding (and persuading people to fix) problems that matter
  
• Is the tester able to adapt their approach to the problem at hand.
  
• How does the dev team feel about that person?
  
  
  Note that those are not things you count but can sort of be represented on a scale, meaning that you can make that assessment on a scale of 1 to 10 or something like that.