In the final part of the series on JSON Schema Validation in MongoDB, the focus is on creating dependencies between properties within a schema, which can help integrate application logic into the database. There are two primary forms of dependencies discussed: property dependencies, where the presence of one property necessitates the presence of another, and schema dependencies, which alter the schema when a certain property is present. The text provides examples of both types, illustrating how to enforce conditions such as requiring a mailing address if a student has graduated. The article also touches upon MongoDB Stitch's validation capabilities using expressions to enhance schema validation, allowing for checks and changes during document updates. Additionally, it highlights the benefits of solidifying a schema to prevent unintended changes and ensure data consistency. In a separate announcement, MongoDB's CEO, Dev Ittycheria, shares his decision to retire, introducing Chirantan “CJ” Desai as his successor, chosen for his extensive experience in scaling technology companies. CJ's leadership is expected to guide MongoDB through its next phase, leveraging opportunities in AI and data-intensive applications, while Dev remains on the Board to ensure a smooth transition. Dev expresses gratitude to the MongoDB team for their dedication and reflects on the meaningful impact of his tenure, emphasizing the evolution of MongoDB and its promising future.