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Scrum: Scrum is an agile framework for managing work with an emphasis on software development. It is designed for development teams of between three to nine members who break their work into actions that can be completed within timeboxed iterations, called sprints (30 days or less, most commonly two weeks) and track progress and re-plan in 15-minute stand-up meetings, called daily scrums.[1][2] Approaches to coordinating the work of multiple scrum teams in larger organizations include Large-scale Scrum (LeSS), Scaled Agile Framework (SAFe), scrum of scrums, and Scrum@Scale, among others. Scrum is an iterative and incremental framework for managing product development.[3][4] It defines "a flexible, holistic product development strategy where a development team works as a unit to reach a common goal",[5] challenges assumptions of the "traditional, sequential approach"[5] to product development, and enables teams to self-organize by encouraging physical co-location or close online collaboration of all team members, as well as daily face-to-face communication among all team members and disciplines involved. A key principle of Scrum is the dual recognition that customers will change their minds about what they want or need (often called requirements volatility[6]) and that there will be unpredictable challenges—for which a predictive or planned approach is not suited. As such, Scrum adopts an evidence-based empirical approach—accepting that the problem cannot be fully understood or defined up front, and instead focusing on how to maximize the team's ability to deliver quickly, to respond to emerging requirements, and to adapt to evolving technologies and changes in market conditions.
A scrum master is the facilitator for an agile development team. Scrum is a methodology that allows a team to self-organize and make changes quickly, in accordance with agile principles. The scrum master manages the process for how information is exchanged. A Scrum Master is NOT a Project Manager. For those new to Agile there is often an assumption made that the Scrum Master and the Project Manager are the same role. This is absolutely not the case. The two roles are very different and they each fit into approaches to projects that are wildly different.