A plan in fire investigation is most often referred to as what?

In the context of fire investigation, a plan typically refers to a detailed procedure developed to systematically approach the investigation process. This is why the term "protocol" is the most appropriate choice. A protocol outlines specific steps that need to be followed to ensure thoroughness, consistency, and accuracy during investigations. It includes procedures for collecting evidence, interviewing witnesses, and documenting findings, thereby ensuring that investigators adhere to established standards and best practices.

The other terms, while related, do not capture the structured and procedural nature of what is typically expected in a fire investigation context. For instance, a guideline may provide broad recommendations but lacks the rigor and specificity that a protocol embodies. A framework generally refers to an underlying structure or system, without the explicit processes. A strategy might denote an overarching plan for achieving an objective in a more general sense without detailing the specific actions to be taken. In fire investigation, adherence to established protocols is crucial for ensuring reliability and validity in the findings, which is why "protocol" is the correct term.