Volleyball is a team sport - it involves communicating with each other inside the court. Suppose the ball is in the middle of two players, uncertainty lies in who'll shout "mine" first or who'll go nearer to the ball and hit it across the net. There is a lot of uncertainty when it comes to communication inside the court which leads to a lot of lost points. Unless you communicate to another player that you're going to give the ball to her,
uncertainty will always be there. This is why, you should always say "mine" or as coach always says, "magusap kayo sa loob ng court" in order to reduce the uncertainty.
This time when it comes to dance, uncertainty is again involved. Certain beats correspond to a certain step and in communicating correctly, all the dancers will dance in sync. It's quite difficult to alleviate uncertainty in dancing because movements are sometimes hard to sync with a lot of dancers involved. With lots of communicating through the repetition of steps and of the performance, however, uncertainty is decreased in time to perform your piece the best way you can, all together. 
Being part of the Blue Babble Band entails alot of uncertainty reduction because as a band, though we are a large group, we need to sound like one. During a game, every band member has to have their eyes on the captain at all times because he will signal or communicate a hand gesture that will start a cheer. To reduce uncertainty in this situation, "tumingin ka lagi kay Ken". He can signal a certain cheer at any point in the game and you have to always be prepared to play it.
All situations and scenarios have uncertainties and true to the theory, we all try to reduce it.
