Final answer:
The HR department is using a structured interview when conducting interviews with multiple employees who hold the same job.
Step-by-step explanation:
The HR department is using a structured interview when conducting interviews with multiple employees who hold the same job. In a structured interview, the same questions are asked of every candidate, and the interviewer uses a standardized rating system to compare their responses. This approach allows for a fair and accurate assessment of each candidate's qualifications and abilities.