11.2.2 Person of Ordinary Skill is a legal term used to refer to a hypothetical person with an ordinary level of knowledge, experience, and skill in a particular area of technology. This person is used as a benchmark when determining whether something is obvious or non-obvious in a patent claim. Specifically, this person is used to help decide if a particular invention was obvious in light of the state of the art at the time of the invention. There are two types of 11.2.2 Person of Ordinary Skill: a person with ordinary skill in the art (PSA) and a person of ordinary skill in the field of the invention (POF). The PSA is an expert in the general field of the invention, while the POF is an expert in the specific field of the invention.