Over six years, Jim Collins and Jerry Porras conducted a landmark study of 18 enduring visionary companies—industry titans that outperformed the broader market by 15x and their peer "silver medal" firms by 6x. Built to Last dismantles pervasive myths: visionary companies don’t depend on charismatic leaders or brilliant initial ideas; instead, they focus on building enduring organizational systems, or "building the clock" rather than "telling time." The book lays out their core principles: unshakable core ideologies that guide decisions without stifling adaptability, a relentless drive to stimulate progress, and tangible mechanisms like Big Hairy Audacious Goals (BHAGs), cult-like cultures that reinforce shared values, evolutionary experimentation, internal leadership succession, and systematic self-improvement. Filled with real-world examples from HP, Disney, 3M, and more, it provides actionable frameworks for entrepreneurs, managers, and leaders to build companies that thrive across generations, not just quarterly earnings reports.