This is a must-read. The Innovator's Dilemma explains why large established companies so often fail to compete against new entrants, and what you can to do to avoid this trap.

From Amazon:
​The bestselling classic on disruptive innovation, by renowned author Clayton M. Christensen.

His work is cited by the world’s best-known thought leaders, from Steve Jobs to Malcolm Gladwell. In this classic bestseller—one of the most influential business books of all time—innovation expert Clayton Christensen shows how even the most outstanding companies can do everything right—yet still lose market leadership.

Christensen explains why most companies miss out on new waves of innovation. No matter the industry, he says, a successful company with established products will get pushed aside unless managers know how and when to abandon traditional business practices.

Offering both successes and failures from leading companies as a guide, The Innovator’s Dilemma gives you a set of rules for capitalizing on the phenomenon of disruptive innovation.

Sharp, cogent, and provocative—and consistently noted as one of the most valuable business ideas of all time--The Innovator’s Dilemma is the book no manager, leader, or entrepreneur should be without.

This book changed my life (well, professional anyway), dramatically improving how I approached building support and delivering on new ideas. If you haven't already checked it out, do so. Now! This one is a must-read for how to be effective in today's business environment. Many thanks to one of my great mentors, Mike S, for introducing me to it.

From Amazon:
Millions worldwide have read and embraced John Kotter’s ideas on change management and leadership.
From the ill-fated dot-com bubble to unprecedented M&A activity to scandal, greed, and ultimately, recession—we’ve learned that widespread and difficult change is no longer the exception. It’s the rule. Now with a new preface, this refreshed edition of the global bestseller Leading Change is more relevant than ever.

John Kotter’s now-legendary eight-step process for managing change with positive results has become the foundation for leaders and organizations across the globe. By outlining the process every organization must go through to achieve its goals, and by identifying where and how even top performers derail during the change process, Kotter provides a practical resource for leaders and managers charged with making change initiatives work. Leading Change is widely recognized as his seminal work and is an important precursor to his newer ideas on acceleration published in Harvard Business Review.

Needed more today than at any time in the past, this bestselling business book serves as both visionary guide and practical toolkit on how to approach the difficult yet crucial work of leading change in any type of organization. Reading this highly personal book is like spending a day with the world’s foremost expert on business leadership. You’re sure to walk away inspired—and armed with the tools you need to inspire others.