The concept of disruptive innovation has gained considerable currency among practitioners despite widespread misunderstanding of its core principles. Similarly, foundational research on disruption has elicited frequent citation and vibrant debate in academic circles, but subsequent empirical research has rarely engaged with its key theoretical arguments. This inconsistent reception warrants a thoughtful evaluation of research on disruptive innovation within management and strategy. We trace the theory’s intellectual history, noting how its core principles have been clarified by anomaly-seeking research. We also trace the theory’s evolution from a technology-change framework—essentially descriptive and relatively limited in scope—to a more broadly explanatory causal theory of innovation and competitive response. This assessment reveals that our understanding of the phenomenon of disruption has changed as the theory has developed. To reinvigorate academic interest in disruptive innovation, we propose several underexplored topics—response strategies, performance trajectories, and innovation metrics—to guide future research.

After twenty years of growth unprecedented in the sports apparel industry, Under Armour finds itself with a new record to beat: making the leap from $5 to $10 billion in sales — a feat only accomplished to date by competitors Nike and Adidas. At the heart of this challenge is how Under Armour can maintain its brand’s authenticity while adding new products that fuel future growth. The case traces the evolution of Under Armour’s brand and describes how the company chose to extend or not extend its brand into adjacent categories and markets in the past. Now Under Armour needs to decide on their next steps. Should the company focus on its core markets? Should it stretch the brand into more adjacencies? Or should it consider something more radical, like app-related sales through subscriptions and wearable technologies?