What is underlying the problem that the database addresses?
Who will be the users of this database?
What kind of data is to be stored in this database?
Will there be any constraints on the data that will be stored in this database? Why?
What real world scenarios will this data represent (i.e. what are the kinds of transactions that you can think of that will take place with your database)?
What kind of information would you expect to retrieve from this database, e.g., the kinds of reports that the various kinds of users might like to see? Or the queries that they would like to run?
What will be the integrity constraints that you can think of? Why?
In what ways do you think your project will give your company competitive advantage?