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"a complete white-room rewrite should be done by a team of engineers"

NO! NO! NO!

Never allow your engineers or anyone else to do a full rewrite of anything that currently works and serves the needs of your users. While they're busy rewriting (and it will take SOME TIME) you're not pushing out new features and your competitors are (remember Lotus 1-2-3?). And if you are pushing new features while your engineers are doing a rewrite they will NEVER catch up.

The solution: Make sure your application has tests from the start (and don't allow any excuses for not writing tests) and you can slowly refactor and rewrite small parts of your app, one bit at a time.

There are some exceptions to this, some companies have managed to successfully rewrite their software from scratch. But consider that a statistical anomaly and don't try to replicate it (and chances are it was rewritten by a team of super hackers, not a bunch of engineers trying to find the most perfect, scalable solution).




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