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Modeling

One of the key steps for the modeling data is to do the survey requirements. Identifying the environment and extract the correct information, separating the parties and the relevant data that formed the tables in the database.
A well-structured database is a major step forward that will avoid future headaches.
I usually use to model a database program Dbdesigner I think the simple and practical.

I think very important to have everything documented, especially if you want to do a commercial software, because that will help you even when you prepare a budget, beyond what has the documentation system is not easily found, the staff usually does not properly documented the structure and development of programs, is more like programming.

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