The above referenced Excel Software Tool is provided for determination of the in-plane stiffness of individual (single bay) Braced Frames at a particular Floor Level of a Steel building. Braced Frames are defined in this software tool as elements of the Lateral Force Resisting System (LFRS) at a particular Floor Level, in which the connection of Steel elements are braced out of plane to ensure the frames can adequately and reliably resist in-plane lateral loads. Examples include Special Concentric Braced Frames (SCBF’s), Eccentric Braced Frames (EBF’s) and Special Moment Resisting Frames (SMRF’s).