In recent years, it has been increasingly striving to make the criminal procedure efficient and at the same time economical. In line with the established international legal standards, the Republic of Serbia for the first time, by the Code of Criminal Procedure since 2006, regulated the agreement on the recognition of a criminal offense. The reformed Code of Criminal Procedure since 2011 introduced two similar criminal procedural forms, an agreement on the testimony of the defendant and an agreement on the testimony of the convicted person. In a short time as it exists in our judicial practice, the agreement on the recognition of a crime has yielded very successful results. It proved to be extremely efficient and economical. By the agreement on the defendant's testimony, the defendant acknowledges the commission of a criminal offense and assumes the obligation to testify against the accomplice. The purpose of this institute is that the public prosecutor obtains a reliable prosecution witness who would contribute to the condemnation of his accomplice with his testimony. As in the literature, the agreement on the recognition of the criminal offense and the defendant's testimony, it gives the character of simplified criminal procedural forms, the author aims to determine whether indeed all segments of the principles of the process economy are realized in relation to the defendant.