Are there methodologies/standards/best practices for describing requirements to developers?

Question

Documentation

Good evening everyone!
1) Tell me, please, are there any methodologies / standards / best practices for describing it's software requirements for business developers?
2) A similar question on writing instructions to users?

Answer 1

Yes, there are many different ones. They differ mainly in the context of application - somewhere one works better, and somewhere else, for example:
1. simple - this is User Story
2. a little more complicated - UseCases , IEEE 830-1998
3. a very difficult case - GOST 34, GOST 19 or GOST R 51904-2002
For operational documentation see RD 50-34.698-90

Answer 2

Look at IREB . But it seems to be mostly distributed in Europe.