Interview guides and associated notes should be retained for the legally required amount of time. Build a library of interview guides. The system should be managed to include the best interview guides within the library so managers can benefit from the good work of their peers. Reduce turnover and training costs. The hiring of higher caliber employees will mean that they are more likely to succeed.
Successful employees stay longer and turnover as well as training time is reduced.
Applicants realize their weaknesses have been revealed in structured interviews and are less likely to file a challenge when not hired. When not hired they may wonder if the real reason was their gender, race, age, national origin, etc. Applicants of properly designed structured interviews know some of their weaknesses have been revealed and are not surprised if they are passed by. Interview guides can constantly be improved as more is learned about their effectiveness. Good interview guides created by HR or a manager can be shared by all.