101 Pa. Code § 21.11
Prior to the commencement of the program for the development of the Pennsylvania Consolidated Statutes, as authorized by the Constitutional Amendment of May 16, 1967, to section 3 of Article III of the Constitution of Pennsylvania, the statutes of this Commonwealth had never been codified. Thus, the initial, and in most cases the most difficult, step in preparing a bill adding new provisions to the Statutes is the identification of the prior statutory provisions to be included in and specifically repealed by the revision. This Subchapter sets forth a number of the more obvious steps to be taken in identifying the appropriate subject matter for a revision bill. However, the steps set forth are not intended to be exhaustive, and merely illustrate the general nature of the inquiry to be made.
101 Pa. Code § 21.11