What is Jobs-to-be-done and how to use it

Jobs to be Done is a theory of consumer action. It describes the mechanisms that cause a consumer to adopt an innovation. The theory states that markets grow, evolve, and renew whenever customers have a Job to be Done, and then buy a product to complete it (get the Job Done). This makes a Job to be Done a process: it starts, it runs, and it ends. The key difference, however, is that a JTBD describes how a customer changes or wishes to change. With this in mind, we define a JTBD as follows: A Job to be Done is the process a consumer goes through whenever she aims to change her existing life-situation into a preferred one, but cannot because there are constraints that stop her.