63 Pa. Stat. § 458.2
The following words and phrases when used in this act shall have the meanings given to them in this section unless the context clearly indicates otherwise:
"Board." The State Board of Certified Real Estate Appraisers.
"Certified Pennsylvania Evaluator." An individual holding a valid certificate issued in accordance with section 6.
"Commissioner." The Commissioner of Professional and Occupational Affairs in the Department of State.
"Property valuation model." A model that expresses the forces of supply and demand at work in the local market and seeks to explain or predict the market value of properties from the available real estate data based on the sales comparison, cost and income approaches to value. The term shall include those models developed for use in mass appraisals that value a universe of properties as of a given date using standard methodology, employ common data and allow for statistical testing.
"Revaluation company." A mass appraisal company conducting appraisals of real property within this Commonwealth.
"Revaluation company personnel." Persons employed by a revaluation company, or by a contractor of a county or a revaluation company, and directly responsible for the valuation of real property or the development of a property valuation model.
63 P.S. § 458.2