For those that are unfamiliar with the round robin style of tournament, this is how it works for 2 on 2 grass and sand volleyball.
Every player is randomly selected into a pool of other players at the beginning of the tournament. Depending on how many players are registered for the given tournament, there could be anywhere from 2 to 12 pools of play. The pools also get broken up differently for same sex vs co-ed round robin play.
Once the players are distributed into the various pools, all the pools then commence to play a mixture of games. The games fall in the format:
Until all the pools have completed the scheduled mixture of games.
After pool play has completed, every player totals the amount of points they scored in each game to get a pool ranking. Once again, depending on how many players are in the tournament, anywhere from 2 to 6 players will pull out of the pool play into the tournament stage. The top 2 players will play together as a team and the 3rd and 4th players will play together as a team (and so on).
Once in the bracket portion of the round robin tournament, you no longer change partners. You will stick with the partner until a victorious team is crowned.
Round robin tournaments offer a great chance to play with a number of different players often improving your ability to adapt and be the most versatile player you can possibly be. It is a great training and learning process to improve your game in all aspects.