Which of the following is not a key aspect of conducting an effective interview?

Conducting an interview in an informal manner is not considered a key aspect of an effective interview, especially in the context of fire and explosion investigations. Professionalism and structure are vital when gathering information from witnesses or involved parties to ensure that the facts are accurately captured and that the individual feels the seriousness of the situation.

Having a clear purpose for the interview helps to focus the conversation and ensures that all relevant topics are covered. Documenting the content of the interview is crucial for maintaining an accurate record of statements made, which can be vital for subsequent investigations or legal proceedings. Preparing for potential witness responses allows the interviewer to anticipate answers and guide the discussion effectively, making it more productive.

In contrast, conducting the interview informally could lead to a lack of adherence to these important protocols, potentially compromising the interview's effectiveness in gathering reliable information.