This document discusses casing design considerations and methodology. It covers key factors that influence casing design like loading conditions, formation strength, and costs. It also describes the graphical method for casing design which involves plotting burst, collapse, and tensile loads on a pressure-depth graph and selecting appropriate casing grades that exceed these loads. Safety factors are also discussed. The document provides detailed steps for constructing the graphical design including calculating burst, collapse, and tensile lines and selecting suitable casing grades based on the intersections.