Prototyping is a method of obtaining early feedback on requirements by providing a model of the expected product before building it. Examples of prototypes are small-scale products, computer generated 2D and 3D models, mock-ups, simulations etc. Prototype allow stakeholders to experiment with a model of the final product rather than being limited to discussing abstract representations of their requirements.
Prototypes support the concept of progressive elaboration in iterative cycles of mock-up creation, user experimentation, feedback generation, and prototype revision. When enough feedback cycles have been performed, the requirements obtained from the prototype are sufficiently complete to move to a design or build phase.
Story boarding is a prototyping technique showing sequence or navigation through a series of images or illustrations. Storyboards are used on a variety of projects in a variety of industries, such as film, advertising, instructional design, and on agile and other software development projects. In software development, storyboards use mock-ups to show navigation paths through web pages, screens, or other user interfaces.
Within the PMBOK® Guide, Prototypes technique is used in Collect Requirements process
Project scope Management
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PMBOK® GUIDE SIXTH EDITION