The variety of forms of Impact exerted by scientific­ technological measures on the national economy development Is reflected by the structure and content of S&T development plans. In compl lance with principal features of progress the S&T development plans are differentiated by managment levels, life cycles duration of a planned period. planning S&T structurally stages and At management levels, the S&T development plans are subdivided Into state plans (the national economy plans>; branch plans (mlnlsterlel end depertmental plans); territorial plans (republics of the union and economic regions); end plens of amelgemetlons, enterprises end orgenlzetlons. The rea II zIng totellty of these plans serves as the b as I c p r I n c I p I e o f soc I a I I s t 270 an Instrument of plennlng-democretlc 0 U) co N centralism which makes It possible to combine fn a centralised manner the Implementation of single S&T policy of the country with the Initiative of working collectives, special features of Union republics and economic regions. The structural subdivision of plans by management levels allows to differentiate the problems of S&T progress taking Into account of their significance and scales. Thus. the state plans envisage solutlon of the most Impor­ tant lntersectoral problems of S&T progress, mastering and Intro­ duction of new products and technologies produced or applied In the USSR for the first time. The branch plans are oriented towards the fulfillment of assignments of the state plan, solution of branch level problems. mastering and Introduction of new products and technologies typical tor a given branch. The plans of amalgamations. enter­ prises and organizations Include the assignments of hierarchical­ ly higher agencies and the assignments of S&T progress Implement­ ed on their own In t~e Interests of scientific and technological development. Plans of various stages of life cycle 
**Analysis**
The text appears to be discussing the planning and management of scientific and technological (S&T) development in a country, with a focus on its impact on the national economy. The text highlights the different levels of planning, from national to enterprise-level, and the various types of plans that address different aspects of S&T development. This suggests that the category should be related to the development and management of S&T, as well as its impact on the economy.

**Category**
Economic development, Science and technology