The requirements of FEMA 350 are based substantially on those of the AISC 1997 Seismic Provisions for Structural Steel Buildings. The engineer has the option of performing the FEMA 350 provision checks for all the seismic provision codes (UBC and AISC). The FEMA 350 provisions are only applicable to Steel Moment Frame structures as indicated in this section. The FEMA 350 provisions take the place or are in addition to some of the requirements of the selected seismic provision code. In all detailed output both the current code section, and the FEMA 350 section that replaces it, are displayed. Note that the June 18, 2001 errata have been incorporated where required.