Cetainly, and if you're setting out to build a framework then by all means build a framework. Or if you're setting out to improve a library then by all means, i

Cetainly, and if you're setting out to build a framework then by all means build a framework. Or if you're setting out to improve a library then by all means, improve the library. But if you're setting to build a web app chances are it's folly to build your own "framework" and ORM and libraries first (note for the absolutists in the crowd: that is purposely _not_ an absolute statement; we can all come up with suitably contrarian one-off edge cases).