We know that the whole development team is responsible for the quality of the product. If only the testers test, there can be no question of shared responsibility.

We know that the whole development team is responsible for the quality of the product. If only the testers test, there can be no question of shared responsibility. Of course, the testers in the team still need it. They bring with them valuable know-how that can not be waived. Nevertheless, all team members can and should contribute to the quality of the product, for example:

• Developers can decompose the software into small, independently testable components.

• Developers can help automate test cases.

• With their experience and know-how, testers can alert developers to potential program vulnerabilities or perform risk analysis. So
  that it is ensured at an early stage that some errors do not even
  occur.

• All team members can and should work with the user to ensure early on that the right thing is being developed.