Early in the design process of your product, service, or system, you want to use tools that reflect what stage of the process you are in. At the start of your process, low fidelity tools like storyboards and paper-prototyping let you create and test out a bunch of ideas really quickly. This rapid iteration helps you figure out where your product needs to go.
Storyboards are especially helpful because they help you create stories about your customers’ problems and their journey to solve them through a series of tasks. Storyboards help you empathize with your customer and they help your team get on the same page about the problems you are solving and for whom. Storyboards also help keep you from drilling down too quickly on features and product details that may seem cool to your team but may not be relevant to your customers.
Want to learn more about storyboards? Check out this fantastic video from HCI prof, Scott Klemmer.