12. Do I have to get the design correct 'up front'?

No.

Unlike so many (perhaps all) tools claiming to be CASE products, Genesis V is designed for use in the real world.  It responds readily to mistakes and corrections because it is strong in maintenance and because designing, specifying, programming and documenting are parallel, interwoven tasks.

If we can promote any specific methodology at all then it has to be Incremental Prototyping.  In other words, it is recognized and accepted
that ...

"The only way for we human beings
to guarantee getting anything right is
to get it wrong (usually several times)
first!"

Such a process may be recognized as Evolutionary.