46 Pa. Stat. § 67
The commission shall undertake, through the standing committees of the Senate and House of Representatives, such studies and investigations as the General Assembly by resolution shall direct.
When a study or investigation is to be made, the Speaker of the House of Representatives shall designate the appropriate standing committee of House and the President pro tempore of the Senate shall designate the appropriate standing committee of the Senate, to make such study or investigation. These two standing committees, when so designated, shall constitute a joint study committee of the commission for such purpose.
During the interim between regular sessions of the General Assembly which convene in odd-numbered years, each joint study committee assigned to make a study shall meet at the call of the chairman of the commission or at the joint call of the chairman of the designated standing committees of the Senate and House of Representatives.
46 P.S. § 67