Formal:
* Demanding: Implies a strong or forceful need.
* Mandating: Suggests an official order or obligation.
* Prescribing: Indicates a specific rule or instruction.
* Necessitating: Emphasizes the essential nature of the requirement.
* Enacting: Implies putting a requirement into effect.
* Imposing: Can be used when the requirement is unwelcome or burdensome.
Informal:
* Needing: Simple and straightforward.
* Calling for: Indicates a specific need or purpose.
* Making it necessary: Emphasizes the result of the requirement.
* Having to have: Highlights the importance of the requirement.
* Involving: Can be used when the requirement is part of a larger process.
More specific alternatives:
* Requesting: Implies a polite or formal ask.
* Insisting: Highlights the strong desire for the requirement to be met.
* Urging: Encourages compliance with the requirement.
* Commanding: Implies a forceful order.
The best word to use will depend on the specific situation and the tone you want to convey.