Quick answer
Phase-gate sequences decisions at fixed checkpoints (rigor, predictability); agile iterates continuously (learning, adaptability) — choose by how well the destination is known.
Phase-gate
Evidence at fixed gates, big-batches, decisions before execution — fits regulated, hardware, capital work.
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Agile
Continuous small increments, learning embedded — fits software and discovery work.
The hybrid
Gates for the big decisions, sprints inside stages — hardware-software products commonly run this.
The honest test
How well is the destination known? Known → gate it; uncertain → iterate toward it.
Bottom line
Phase-gate sequences decisions at fixed checkpoints (rigor, predictability); agile iterates continuously (learning, adaptability) — choose by how well the destination is known.
FAQ
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