This document provides guidance on key sections of an NIH R01 grant application, including Significance, Innovation, and review criteria. It discusses that Significance refers to how the project will advance scientific knowledge or improve clinical practice if successful, not just the importance of the disease topic. Reviewers evaluate the rigor of prior research supporting the project and the applicant's plans to address weaknesses. Innovation can involve novel concepts, approaches, technologies, or new applications of existing methods. The simplified NIH review framework focuses on whether the proposed research should be conducted based on Significance and Approach.