This constitutes an Important requirement for their unity and succession, further detailing of the Principal Guide! lnes targets In five-year plans, and the five-year plan targets In annual plans. The unity and succession of structures of the planning documents Is supplemented by the unity and succession of forms used for the elaboration and approval of the above-mentioned planning documents. A five-year plan Is most comprehensive from the point of view of Its structure. It Is the major state plan given the fact that the five-year period forms the basis of planning In the USSR. During the Indicated period It Is possible to solve cardinal problems, Including social life and scientific and technolgolcal progress. A longer perlo1d. would pose certain problems for elaboration and decision-making. It Is possible to forecast with a greater degree of reliability and take decisions for longer periods (10-15 years) when tackling the most outstanding problems. such as radical qual ltatlve transformations In technology, territorial siting of productive forces, social and economic development of the society. The annual plan Is based on a five-year plan and constitutes Its Integral part. This Is an Instrument for planning ancf managIng the process of Imp I ementat I on of-five-year pI an targets. Annual pI an Is a current pI an. Its targets are often elaborated <>n 6-month or 3-month basis. However, In doing so It Is necessary to avoid shifting of the major •toad• to the end of the year. The same terms are used by the ministries, departments and the USSR Central Statistical Board for reporlng the Implementation progress to the USSR State Planning Committee as wei I as for control I lng the Implementation process. During a given year, the Implementation of scientific and technological programmes Is carried out In their full scope and 
**Analysis**
The text appears to be discussing planning and management strategies for economic development, focusing on the structure and implementation of plans, targets, and progress reports. It mentions the importance of unity and succession in planning documents and the role of annual plans in achieving five-year targets. The text also touches on the elaboration and approval of planning documents, as well as the reporting and control of implementation progress. These themes suggest that the text is related to economic development, specifically planning and management.

**Category**
Economic development, Industry