It depends on the situation. Email should be accompanied by a messaging system that a) lets you know if the other person is available to chat, and b) provides r

It depends on the situation. Email should be accompanied by a messaging system that a) lets you know if the other person is available to chat, and b) provides real-time interaction. The combination is more efficient than phone or video conferences, and much more efficient than in-person conferences, especially those requiring a plane trip. These more often involve social banter and often include participants who are only marginal contributors or time wasters.