rigid framework

Translations
жесткая рамка
The project operates within a rigid framework.
Проект работает в рамках жесткой рамки.
Definitions
A rigid framework refers to a structured system or set of guidelines that is inflexible and does not easily adapt to changes or new information. It often implies strict adherence to rules or standards, limiting creativity and innovation.
Words
framework

noun
структура
rigid

adjective
жёсткий