The final paper will focus on the study of paper materials with the aim of carrying out the protection (research, strategy and priorities before the protection procedure itself). The method of examining the paperwork for the purpose of protection is to examine the condition of the material for the purpose of making the proposal of preventive, conservation or restoration procedures. In practice, various approaches are used, most of which are the three ways of recording the state of the material: randomly sampled by large volumes of material that offers the most accurate results, randomly sampled small amounts of material and the study of the individual unit of matter where each subject is examined, Each creates an individual recommendation for further retention and use. This approach is mainly used for book materials, while similarly applied to two-dimensional materials. In the theoretical part, I explain the methodology of such research in relation to the similarities and differences between the institutions that preserve the paperwork, i.e. what kind of methods they use for their materials, while in practical terms I illustrate it on the objects I worked on in the State Archives in Rijeka.