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Note added at 9 мин (2020-07-23 21:06:57 GMT)
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Применительно к исходнику: Terms of reference for the project feasibility study.

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Note added at 14 мин (2020-07-23 21:12:08 GMT)
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На русском языке то же, что и "техническое задание на разработку технико-экономического обоснования" -> https://www.google.ru/search?newwindow=1&biw=1045&bih=730&tb...

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Note added at 16 мин (2020-07-23 21:14:01 GMT)
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Ref: https://dc-region.ru/razrabotka-teo-dlya-ob_ektov-proizv

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Note added at 30 мин (2020-07-23 21:27:47 GMT)
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Formal definition

A project feasibility study is a comprehensive report that examines in detail the five frames of analysis of a given project. It also takes into consideration its four Ps, its risks and POVs, and its constraints (calendar, costs, and norms of quality). The goal is to determine whether the project should go ahead, be redesigned, or else abandoned altogether.[5] The five frames of analysis are: The frame of definition; the frame of contextual risks; the frame of potentiality; the parametric frame; the frame of dominant and contingency strategies.

The four Ps are traditionally defined as Plan, Processes, People, and Power. The risks are considered to be external to the project (e.g., weather conditions) and are divided in eight categories: (Plan) financial and organizational (e.g., government structure for a private project); (Processes) environmental and technological; (People) marketing and sociocultural; and (Power) legal and political. POVs are Points of Vulnerability: they differ from risks in the sense that they are internal to the project and can be controlled or else eliminated.

The constraints are the standard constraints of calendar, costs and norms of quality that can each be objectively determined and measured along the entire project lifecycle. Depending on projects, portions of the study may suffice to produce a feasibility study; smaller projects, for example, may not require an exhaustive environmental assessment.
https://en.wikipedia.org/wiki/Feasibility_study