I am 24 years old boy, Mustafa Ekim, from Istanbul / Turkey.

I have graduated from university on 2006, and done my military service
this year. Now I'll start working on a IT company in Turkey which mainly
focuses on mobile applications.

Even though I am not a software expert & engineer, I really impressed by
rails last year. Since that time, I am trying to create my application.

When I were a student, I always learned that I should draw ER diagrams,
Data Flow Diagrams, UML diagrams etc. to be certain that the project is
understood correctly by everybody in the same way. And it is always said
that these documentation steps are very very critical for the success
and sustainability of the project.

However, even though I've read at least 2 rails books, I never see an ER
diagram or UML diagram. So the question is, in the business life, do you
use these steps? Or these steps are not usable in practice? How do you
design your application?

Any readings or books for this stage of rails development will really
help me.

Thanks

Mustafa Ekim