But now, I would like to know if there is a template or model for documenting system requirements when using an Agile methodology such as Scrum.
There is no template for Scrum, because Scrum does not prescribe a way to capture requirements and allows you to use anything that suits your context. Many (web teams) use User Stories , and this works well for them, but there is no general agreement. Just in case, the recommended template for user stories:
"As <user type>, I want <some goals> to <some reason>."
But nothing forces you to use stories, and they are not suitable for all projects (for example, Jeff Sutherland said that he will never use stories again for PDA projects, the user interface and navigation rules are too complicated for stories).
With Scrum, I would say that the general principle is to create specifications enough (and just in time) (which differs from a model with an exhaustive use of RUP in this approach), you decide which format is suitable for your context.
source share