Investigational new drug (IND) application is an important milestone that marks the entry of a molecule into clinical development. Knowing the objectives, expectations, and processes of assembling and filing an IND is the key to not only a successful filing but also a promising clinical development path forward. Often, there are cases where too many nice-to-have studies crowd in the package but critical studies/issues are not addressed, and this can lead to significant delays in clinical development. Additionally, the regulatory environment is changing as rapidly as the industry. Therefore, keeping up to date on the regulatory requirements and the industry’s best practices in different aspects including non-clinical safety, PK, CMC, and clinical plan is paramount.