Through qualitative interviews this study investigates the approach, comprehension and attitude to the concept of quality assurance in secondary school. We have examined how the school staff in our interviews understands the signification of the concept quality assurance and also how the concept is used in praxis. For the analysis of the result of our study we used Foucault's power analysis. The aim of this study is to reach an immersed depiction of the concept, and of how quality assurance can function as a method for maintaining disciplinary structures. The result of our study shows that the school staff participating in our interviews are experiencing and understanding the signification of the concept quality assurance in a multifaceted and diverse way. The concept can be considered ambiguous, since there currently is no common definition of it from the state authorities. The interviews also indicate complexity from a teachers perspective when quality assurance enter the schools, but it also shows positive effects for the school in the perspective of legal security and development.