Two latest general rules of volleyball
4-2-2 new NOTE: Beginning July 1, 2016 either the libero or his/her teammates shall wear a solid colored uniform top that is clearly in contrast from the predominant color(s) of the teammates uniform top. The solid color uniform top shall meet specific design requirements.
Rationale: When both the libero and his/her teammates are in multi-colored uniforms of the same color combinations, it can be very difficult to discern the liberos legality when playing the ball. Requiring either the libero or the other team members to be in a solid colored uniform of contrasting color will assist the referees in determining legal playing actions.
5-2-2: The referees equipment shall include a watch along with a whistle, coin and yellow/red cards.
Rationale: The watch is needed as an alternate to a visual timing device in the event of a malfunction.
In 2008, the NCAA changed the minimum number of points needed to win any of the first four sets from 30 to 25 for women's volleyball (men's volleyball remained at 30.) If a fifth (deciding) set is reached, the minimum required score remains at 15. In addition, the word "game" is now referred to as "set".
Changes in rules have been studied and announced by FIVB in recent years, and they have released the updated rules in 2009