Ongoing Commissioning (OCx) provides the means and process to optimize and sustain building performance on an ongoing basis through investigating, analyzing, and monitoring the performance of building systems. Ongoing commissioning, also known as continuous commissioning or recommissioning, is a dynamic process aimed at optimizing the performance and efficiency of building systems over time. Unlike traditional commissioning, which occurs primarily during the initial construction or renovation phase, ongoing commissioning involves regular monitoring, analysis, and adjustment of building systems to maintain peak performance levels. It encompasses tasks such as data collection, trend analysis, system diagnostics, and performance optimization to identify and address issues proactively, ensuring that buildings operate at their highest efficiency and occupant comfort levels. By incorporating ongoing commissioning into facility management practices, organizations can extend the lifespan of their assets, reduce energy consumption, and minimize operational costs while maintaining a healthy and productive indoor environment for occupants.