It may be as innocuous and routine as a shift change at your fire station. Perhaps it’s an unusually large-scale event, such as a concert or a famous guest speaker in your city or town. People involved with attack pre-planning may watch intended targets, along with the activities of first responders, to determine security weaknesses, points of entry, traffic patterns, and times of day that offer the most opportunity. Surveillance might include: extensive photography, videotaping, preparing drawings and diagrams, or preparation of charts and graphs to record times and details of events.