While the daily diary is crucial for documenting work progress (A), recording important events like OSHA inspections (B), and potentially noting training activities, a potentially important use not directly related to efficient daily management is that it can serve as a source of information during litigation with the client (D) by providing a detailed record of site conditions, work performed, and any relevant incidents. Scheduling a new-worker orientation (C) is more of a planning task than a daily record. (Fundamentals of Crew Leadership, Fourth Edition, NCCER, Section 2.2.3 Maintaining a Daily Log)