Four PMF frameworks — Andreessen, Olsen, 7-Fit, and Sequoia Arc — aren't rivals. They're lenses. Here's how to use them as a diagnostic, not a checkbox
Stop Claiming Product-Market Fit. Start Diagnosing It
Disruptive Innovation: Finding Opportunities in Crisis
Incumbents retreat during downturns. Markets get abandoned. Segments get underserved. That's not a problem for disruptors — it's their opening
harish.balasubramanian 