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The article refers to dozens of police and fire officers, including Battalion Chief Joseph Pfeifer the first chief at the towers, Assistant Chiefs Callan and Burns who faced radio communication issues, and Lt. Dan Williams form Ladder Company 16 where off duty firefighters disobeyed his direct orders to go home. Many other officers are quoted in the article. Two of the significant actors included are Thomas Von Essen, the fire commissioner and Police Commissioner Kelly, who acted as the public faces of the departments during the subsequent interviews and investigation.

Data visualization is primarily determined by the type of data being gathered and the system for data collection being used. The app integrates data in order to both make large quantities of data easily viewable and understood, as well as compare studies with existing data stored on the system.