Do Scrum teams need to be co-located?
A Scrum team is extremely high productivity if it’s co-located, that is, the nuances of what everyone’s thinking and working on is quickly communicated with minimal disruption. If people are not co-located, video conferencing, email, instant messaging – all those tools are good workarounds, they cut productivity but many, many teams Scrum and are not co-located; it’s just the best they can do.