The writer is revising the following passage. Paragraph 1: A fire department scheduled inspections mainly according to building age, reasoning that older wiring and exits often required attention. The system overlooked several newer facilities that stored unusually hazardous materials. Paragraph 2: The department kept age as one factor but added material type, occupancy, and prior violations to the inspection model. A newer building could now receive earlier review when its actual risks warranted it. Which sentence belongs between the paragraphs because it both looks back to a simple age-based model that missed other risks and looks ahead to a multi-factor inspection priority system?