You mean the "What to store" part?

Some of it was just me jotting down the fields that I think will be required to store for each of the data stores, the rest was me reading through the spec document that I developed in part 1 of this series, and then typing up all definite fields that I could identify.

The process of figuring out what to store is very app specific, and as I mentioned in the article as well, it will probably change as the app development progresses.

Hope that helps a bit.