How was the PADI Recreational Dive Planner tested?

The PADI Recreational Dive Planner (RDP) was developed through a combination of research, theoretical calculations, and practical application in diving scenarios. The planner incorporates tables that were created based on extensive studies of the effects of pressure and nitrogen levels on the body, as well as empirical data collected from divers in the field.

It’s important to note that while theoretical calculations played a significant role in the design of the planner, it was also validated through real-world diving experiences. This dual approach ensures that the RDP is both scientifically sound and applicable in practice, allowing divers to plan their dives safely and effectively. The development process did not rely solely on either theoretical calculations or solely on experiences from deep dives, thus making "None of the above" the accurate choice in this context.