When the core domain does not work, your business cannot run.
This core domain should have both the value hypothesis and the growth hypothesis be validated through validated learning.
Once your core reaches an MVP state where feedback can be gathered from, you should launch to kick start this Incremental, iterative process.
Link to original
Reference
Fried, Jason, and David Heinemeier Hansson. Rework. 1st ed, Crown Business, 2010.
Highlights or timestamps
When starting your company, focus all your efforts on building the core of your business. Without this core, your business cannot function.
— ^badc0e from Rework
The core should be something you think will be stable in time. Amazon’s core isn’t only about books; it’s about fast shipping, affordable prices and a great selection.
— ^1eecad from Rework