little_pinecone

This game is amazing. I borrowed Index from a friend to play it and I loved every minute of it.

I reply it from time to time. I love it!

Basically what @clobble_wobble said. For a fast introduction I recommend Domain-Driven Design Quickly (available for free). If you are interested in gathering requirements in a way that can also strengthen your understanding of the business domain, you may want to check the Event Storming technique.