This document discusses using the Project Definition Rating Index (PDRI) combined with a feasibility study to better predict the outcome of infrastructure projects. The PDRI is a rating tool that assesses a project based on categories and elements, with a lower score indicating better scope definition and higher chance of success. While feasibility studies are commonly used for infrastructure projects, some still fail despite positive studies. The document proposes that combining PDRI assessment with feasibility study data can help identify hidden risks and provide a more comprehensive understanding to improve project planning. It then outlines the PDRI assessment process, describing its sections and elements that are rated based on definition levels. Conducting a PDRI study based on feasibility study findings can predict costs,