Part I is an extended summary of the latest main recommendations, as brought out in the text of ICRP Publication 60 (1991), using the language of the original publication itself to the extent possible. The order of presentation is the same as that of ICRP 60. Starting from a brief history of the ICRP and the development of ICRP recommendations (Chapter 1), a summary is next given (Chapter 2) of the quantities and units in radiological protection. Chapter 3 summarizes current knowledge on the biological effects of radiation. Chapter 4 deals with the conceptual framework of radiological protection, an area in which ICRP has thoughtfully developed a unique, logical and comprehensive system. Chapter 5 deals with the application of the system of protection for proposed and continuing practices. The basis for the currently recommended numerical values for the dose limits is explained. Chapter 6 is concerned with the application of the system in the case of intervention (following emergencies and accidents). Chapter 7 deals with the implementation of the recommendations, with special reference to the organizational aspects: Chapter 8 is a summary (as given by the ICRP itself) of the recommendations