" Predictable marketing requires an understanding of the circumstances in which customers buy or use things. Specifically, customers—people and companies—have “jobs” that arise regularly and need to get done. When customers become aware of a job that they need to get done in their lives, they look around for a product or service that they can “hire” to get the job done. "

― Clayton M. Christensen , The Innovator's Solution: Creating and Sustaining Successful Growth