Develop, evaluate or communicate a concept or design.
Start by determining one, or a few, conceptual, design or technical challenges you wish to tackle in the upcoming prototyping cycle. Determine which kind of prototype is suitable to evaluate the outcome (low-fidelity or high fidelity); for example: paper prototype, digital prototype, or video prototype. Create and evaluate the prototype.
A mind-set that promotes ‘fail fast, fail often’.
A purposeful making attitude and prototyping skills.
The ability to ‘kill your darlings’ if the feedback is negative.
Prototyping materials or tools (paper, video, prototyping languages or toolsets).
Sometimes it is a bit fuzzy when sketching ends and prototyping starts. Sketching focuses on exploration and prototyping focuses on design challenges and evaluating your outcome.
Universal Methods of Design has a few pages on prototyping chapter 58 (parallel prototyping) p122 and chapter 66 Prototyping p138 also the chapter 71 on Role-play (p148-149) is relevant for this technique.