As used in this article:

“Classification system” or “classification” means the plan, system or arrangement for recognizing differences in exposure to hazards among industries, occupations or operations of insurance policyholders.

“Department” means the Insurance Department of the Commonwealth.

“Experience rating” means a rating procedure utilizing past insurance experience of the individual policyholder to forecast future losses by measuring the policyholder's loss experience against the loss experience of policyholders in the same classification to produce a prospective premium credit, debit or unity modification.

“Market” means the interaction in this State between buyers and sellers of workers' compensation and employers' liability insurance within this Commonwealth pursuant to the provisions of this article.

“Provision for claim payment” means historical aggregate losses projected through development to their ultimate value and through trending to a future point in time, but excluding all loss adjustment or claim management expenses, other operating expenses, assessments, taxes, and profit or contingency allowances.

“Rate” or “rates” means rate of premium, policy and membership fee or any other charge made by an insurer for or in connection with a contract or policy of insurance of the kind to which this article applies.

“Rating organization” means one or more organizations situate within this Commonwealth, subject to supervision and to examination by the commissioner and approved by the commissioner as adequately equipped to perform the functions specified in this article on an equitable and impartial basis.

“Statistical plan” means the plan, system or arrangement used in collecting data.

“Supplementary rate information” means any manual or plan of rates, statistical plan, classification system, rating schedule, minimum premium policy fee, rating rule, rate-related underwriting rule and any other information, not otherwise inconsistent with the purposes of this article, prescribed by rule of the commissioner.

“Supporting information” means the experience and judgment of the filer and the experience or data of other insurers or organizations relied on by the filer, the interpretation of any statistical data relied on by the filer, description or methods used in making the rates and any other similar information required to be filed by the commissioner.