Best way to project, plan and structure an app with CI

Hi.

1- I start with all the Software Engineering.

2- Create the database.

3- Extend the CI_Model and CI_Controller.

4- Work on Model and Controllers

5- Work on views.

I do it this way because I have from the SE all the prototypes of every Use Case, and I prefer to go from the complex to the simplest. I also follow the KISS and DRY philosophy XD