Scrum is a lightweight approach to project management based on iterative and incremental practices and which is particularly well suited to e.g rapid software development. It differs from more traditional project management insofar as it is not ‘artefact-driven’ – it does not rely heavily on documents (user requirements, analyses, specifications, design documents, etc etc) Rather it is based on  “a flexible, holistic product development strategy where a development team works as a unit to reach a common goal”, challenges assumptions of the “traditional, sequential approach” 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 in the project.