This document outlines the segmental approach to analyzing congenital heart diseases. It describes analyzing the heart in three segments: the atria, ventricle, and great arteries. Sequential segmental analysis involves examining each segment using clinical exams, imaging like echocardiograms, and their connections to identify any abnormalities. This approach was developed in the 1960s and helped standardize the description of various congenital heart defects by systematically analyzing each heart segment and the relationships between them.