Concept
Four Stages
2 books in the library reach for this idea - each in its own way. When independent authors converge on one concept, it usually deserves attention.
Finish Big
How this book uses it: Exploration, Strategy, Execution, Transition - each requires different skills and mindset.
Zero to Sold
How this book uses it: Preparation (research, validation), Survival (launch, first customers), Stability (systems, processes), Growth (scaling, potentially selling).