Teleology refers to the use of the ultimate purpose or design as a means of explaining a phenomenon.
This approach to analysis has failed philosophers since the time of Hippocrates, and is why the scientific method has been accepted and endorsed in medicine. In PT and other medical professions we have an inherent authority role. Our society has placed the consumption of professional medical services in a very different tradition and category than buying a new phone or wrench. Those can be easily returned, but the patient who has entered our offices and entrusted us with their health has given a great deal more than their money to us. I have found it to be reliable and valid, therefore I can feel I can use it.