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Parkinson's Law: It’s real, so use it
Yes, just set that deadline.
Putting challenging timeboxes on projects in a healthy environment can lead to serious innovation and creativity. It's such a simple technique, but when you compound its usage over a year at a big company, you will be amazed at the difference it makes. If you don't, then one day you'll look around and wonder why your startup turned into the software equivalent of local council's tax office.
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