1. Starting from scratch is rarely a good idea. 2. It always sounds like a better idea than it actually is. 3. Item 2 is true even if you think you've account

1. Starting from scratch is rarely a good idea. 2. It always sounds like a better idea than it actually is. 3. Item 2 is true even if you think you've accounted for item 1. Is there something specific that you want that cannot be implemented reasonably on existing systems? Unless you have a specific compelling benefit that only a rewrite can grant, focused narrow rewrites are the way.