During an investigation, what should a diary capture on a daily basis?

• A. Daily progress and administrative tasks.
• B. Witness histories and alibis.
• C. Daily progress, actions taken, and important observations.
• D. Final reports and court dates.

Answer: (C)

A diary in an investigation serves as a running, day-by-day record of the case, focusing on what has been accomplished, what actions were taken, and what was observed that could affect the case. This keeps a clear, chronological account of progress and decisions, including interviews conducted, evidence collected, leads pursued, and updates on the investigation’s status. It also captures important observations—changes in the scene, surprises in statements, inconsistencies, or new facts—that guide the next steps and help prevent memory gaps later on. The diary becomes a reliable narrative that supports subsequent reports and any court-related work.

Administrative tasks by themselves don’t show how the case is moving forward or what real investigative decisions were made. While witness histories and alibis come from witness statements, a diary’s daily entry is about recording the day’s investigative activities and key observations, not compiling full witness histories. Final reports and court dates come after the investigation is concluded and are outputs rather than daily notes, so they don’t belong in the day-to-day diary focus.