The author characterizes one of the most crucial legal sources of the Polish-Lihuanian Commonwealth. It was the only official procedural code of the „land law” accepted by the part of the general sejm in 1523, which was in force until the fall of the state. It consisted of 111 articles separated into two parts. The
first (articles 1–75) included legal provisions of normative character; the second was a collection of forms connected to various legal acts. The Formula was not a complete codification of procedural law; significantly, it did not regulate the evidence. Most of the provisions were devoted to the execution of judgments. During works on Formula, its creators used previous sources and compendiums, especially on the Lesser Poland law. It was a helpful achievement representing high legal quality. The most significant innovation of Formula was the introduction of the appellation.