> What really happens is that you have a set of requirements and an idea of how you are going to implement the feature.

The thing is, your story cards or whatever are meant to be a live document. You have the big meeting, the next day you realise that what you came up with doesn't work, you grab a coffee with your stakeholder and talk it through, come up with a new plan, and you change the card you're working on. Probably check with the tech lead first, but it's that flexible.

> In SCRUM what usually happens is the SCRUM master will tell you that the rules say [...]

This SCRUM thing sounds evil.

> Just do whatever makes sense! Its really not that difficult.

This is probably the best advice ever for any development team. Just do the thing!