One-on-one meetings have minimum possible number of people required for information exchange (2 participants). 1) Discussions are very valuable for team coordi

One-on-one meetings have minimum possible number of people required for information exchange (2 participants). 1) Discussions are very valuable for team coordination, so having meetings is very important for efficient teamworks. 2) In order to contribute, every person, participating in the meeting, must understand the discussion. 3) The more people are in the meeting - the more dumbed down the discussion must be in order to allow everyone to follow the discussion. That makes meetings with larger number of people - less efficient. Which makes meetings with 2 people (one-on-one) - the most efficient.