In addition to learning about the firm or agency, you will need to understand the organizational chart of the organizations so you can determine which department or division you will be working with if you receive an offer. Find out the name of the Department/Division and its function related to the other departments/divisions. How many people work for the department/division, and what types of employees work in the department/division? Is your position one of many, or is it unique? What type of management structure has been established for the department/division? Is it divided into sub groups?
If you are unable to discover this information from your Internet search, then ask Human Resources for more information. If you know someone who works for the agency, contact them. If you understand more about the department/division and the position, then you can provide better answers to the interview questions and show that you have done some research. If you are unable to gather this information before the interview, use some of these questions at the end of your interview to ask the person(s) you meet with. This shows your interest in the specific organization and position.