“If the team is uncertain about how to achieve the sprint goal or if experimentation or prototypes need to be done, then the sprint should be shorter. Uncertainty implies that the work eventually required for the sprint might be significantly different from what was anticipated at the start. If this is the case, it’s better to change direction after two weeks than four.”
Reference: “Agile Game Development with Scrum”, Clinton Keith, Addison-Wesley, 340 pages, IBSN 978-0-321-61852-8
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Get more details on this book or buy it on amazon.co.uk