First, in 1954, the AEA did not mention the role of states in regulating the use of nuclear materials. Many States have expressed concern about the liability they may have in this area and have expressed interest in a clear definition of the limits of federal and national autonomy in nuclear materials. This need for clarification was particularly important because the federal government, while retaining sole responsibility for protecting public health and safety from the risks of radiation from AEA radioactive materials – defined as a by-product, source and special nuclear materials – States continued to consider that States were responsible for protecting the public from the risks of irradiation from other sources such as X-ray machines and natural radioactive materials. 5. For the purposes of this statement of principle, economic factors are the costs incurred by the regulated community to comply with rules affecting more than one regulatory jurisdiction in the NMNP. 1. The implementation of the Contracting States Programme is described below and contains: (a) principles of good regulation; b) performance evaluation on a consistent and systematic basis; (c) the responsibility to ensure adequate protection of public health and public safety, including the physical protection of contract equipment; (d) compatibility in areas of national interest; and (e) sufficient flexibility in the implementation and management of programs to meet the individual needs of the state. The elements of the adequacy programme  focus on the protection of public health and public safety within a given contracting state, while elements of the compatibility programme focus on the impact of national regulation of contract equipment by a State party or its potential effects on other legal systems. Some elements of the compatibility program may also have an impact on public health and safety; therefore, they can also be considered elements of adequacy program.
Based on this statement, elements of the NRC program (including rules) can be divided into five compatibility categories (A, B, C, D and NRC). In addition, elements of the NRC program can also be identified as particularly important for health and safety (H-S). These six categories (A, B, C, D, NRC and H-S) form the basis for the evaluation and classification of elements of the NRC program. The NRC and Agreement State radiation control programs have been set up by regulators for the safe handling, use and storage of contract equipment.