The concept of sprints as short, iterative practices that deliver results, the notion of transparency and self-organization, the focus on meetings for alignment and decision making, and the retrospective process are all references. The name Project Sprint is inspired by the Scrum sprint.
The roles and tensions and their relationships, which are core elements in the teaming activity, are based on the concept of holacracy.
This concept was proposed by Amy Edmondson. I share the importance of creating an environment where people believe it is safe to say whatever they want in a team. It was brought to attention by Google's research project on highly productive teams.