Agile software experts tend to describe phase gate processes as obsolete or inherently “waterfall” and therefore evil — but this is more a reflection of how poorly the Agile coach understands the nature of product development outside of software.

Agile Change Management
What is fail fast? Fail fast is the principle of freely experimenting and learning while trying to reach the desired result. By quickly finding the failures, you can catapult learning and optimize solutions instantly to reach your goal. The concept of fail fast is strongly connected to the Agile methodology.