The document outlines the process for designing and verifying a combined footing ("Zapata Combinada"). It describes: 1) Pre-dimensioning the footing by calculating the required area based on load and calculating member sizes. 2) Design stage where ultimate loads are calculated and used to determine shear, moment, and verify shear and punching capacity. 3) An iterative process is used to verify shear capacity and punching shear resistance and flexural reinforcement is designed using moment diagrams and code requirements.