Programmers can partially test their own code, but may miss stuff, I think. Same probably applies to other testers too. Programmers should test their own code,

Programmers can partially test their own code, but may miss stuff, I think. Same probably applies to other testers too. Programmers should test their own code, but other people should probably also test it. (My own projects I pretty much write it by myself, and test it by myself. Although, I would like other people who are also interested to also test it, but currently it isn't.)