Interviews are one-on-one, face-to-face conversations. In these conversations, the interviewer(s) asks the same set of questions to a number of people, but talking to only one person at a time. Interviews require more time and resources than surveys, but provide more detailed information. Record interviews so that statements can be accurately reviewed and analyzed. Since interviews usually involve fewer people than surveys, you should interview a range of people who represent all the important groups associated with the change. One drawback to interviews is that the data can be challenging to analyze because it may be quite detailed or because there may be extra material that is not important to the evaluation.