The National Historic Preservation Act (NHPA), 16 U.S.C. 470 et seq., directs each Federal agency, and those Tribal, State, and Local governments that assume Federal agency responsibilities, to have a historic preservation program - that is, a program to protect historic resources and avoid or minimize possible harm that may result from agency decisions and actions. The NHPA does not prohibit change to historic properties, but it does require that alternatives be considered. Early consideration of historic places in agency planning and full consultation with all concerned citizens are the keys to effective historic preservation. Federal agency responsibilities are mandated particularly in Sections 106 and 110 of the Act.