This document discusses seismic analysis of regular and irregular buildings using ETABS software. A 15-story reinforced concrete building model was generated for both regular and irregular configurations. Mass and stiffness distribution influence how multi-story buildings respond during earthquakes. Irregularities can cause damage as seen in the 2001 Bhuj earthquake in India. The objective is to conduct dynamic analysis of regular and irregular frames and compare results. Analysis considers factors like storey deflection, storey shear, and stiffness. Previous studies found plan configuration and symmetry affect seismic response, with irregular structures experiencing greater damage.