A big project is a wall of risk and uncertainty. Breaking it into small, independently-shippable pieces makes it plannable, parallelizable, and de-riskable. The art is slicing so each piece delivers value and surfaces risk early.
How to slice
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✓ Slice VERTICALLY — thin end-to-end features, not horizontal layers
✓ Ship the RISKIEST/most uncertain part early — learn before you commit
✓ Make each slice INDEPENDENTLY valuable and shippable if possible
✓ Keep slices SMALL — days, not months
✓ Sequence so the team can work in PARALLEL
✓ Define DONE for each (tested, deployed, not just "code written")