The Foundation of Structured Interviews
There is no doubt that structured interviews are more reliable than the non-structured variants. By structuring interviews you reduce bias, such as the effect of the first impression. As soon as you, as a recruiter, see an applicant, you have (unconsciously) already made an initial judgment about someone, and there is a fair chance that this judgment will influence the nature of the questions and ultimately the final conclusion. For example, candidates with a migration background are more likely to be asked questions about the level of their integration and therefore fewer questions regarding the job. Research shows that these candidates receive a less positive review than native candidates. However, this difference is significantly less or even absent if a structured interview has taken place.