In Hungary, seed production operates within a strictly regulated certification system defined by legal provisions. The purpose of this system is to preserve and monitor the quality and genetic value of seeds, which form the foundation of crop production. One of the main elements of the certification process is the small-plot post-control testing conducted at the Monorierdő Variety Post Control Station of the National Food Chain Safety Office (NÉBIH), commonly referred to as variety post-control. This procedure represents the final, so-called progeny control phase of seed certification and includes two main types of testing: varietal identity and varietal purity verification. Both are based on the principles of distinctness, uniformity, and stability (DUS), which ensure that the seeds of each variety remain clearly identifiable, homogeneous, and genetically stable across generations. The implementation and evaluation of these tests are defined in detail by national standard and internal regulation. These documents specify the methodology of variety post-control, the criteria for assessment, and the official procedures of certification. This process allows for the continuous monitoring of variety preservation and multiplication, contributing to the reliability of seed production, the protection of seed quality, and ultimately ensuring the genetic stability of crop production.