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DHH has a nice methodology that works with fixed deadlines: his basic rule is that features can be dropped/simplified, but deadlines must be met.


He's applying an old concept. The Iron Triangle has been in use since the 1950s.


If time is fixed, then scope and/or cost must change.

This is true, but fixing the deadline and not committing to the scope requires clear communication by the project management / sales teams with the clients about it, and this is rare.

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