Question: When did games get the name "sets" and have their win value reduced to 25 points?
About the article "Volleyball", section "Scoring".

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When the ball contacts the floor within the court boundaries or an error is made, the team that did not make the error is awarded a point, whether they served the ball or not.
If the ball hits the line, the ball is counted as in.
The team that won the point serves for the next point.
If the team that won the point served in the previous point, the same player serves again.
If the team that won the point did not serve the previous point, the players of the team rotate their position on the court in a clockwise manner.
The game continues, with the first team to score 25 points by a two-point margin is awarded the set.
Matches are best-of-five sets and the fifth set, if necessary, is usually played to 15 points.
(Scoring differs between leagues, tournaments, and levels; high schools sometimes play best-of-three to 25; in the NCAA matches are played best-of-five to 25 as of the 2008 season.
)Before 1999, points could be scored only when a team had the serve ("side-out scoring") and all sets went up to only 15 points.
The FIVB changed the rules in 1999 (with the changes being compulsory in 2000) to use the current scoring system (formerly known as "rally point system"), primarily to make the length of the match more predictable and to make the game more spectator- and television-friendly.
The final year of side-out scoring at the NCAA Division I Women's Volleyball Championship was 2000.
Rally point scoring debuted in 2001 and games were played to 30 points through 2007.
For the 2008 season, games were renamed "sets" and reduced to 25 points to win.
The 2001 NCAA Division I Women's Volleyball Tournament began on November 29, 2001 with 64 teams and ended December 15 when Stanford defeated Long Beach State 3 games to 0 in San Diego, California for the program's fifth NCAA title.
Led by future Olympians Logan Tom and Ogonna Nnamani, Stanford stunned previously unbeaten Long Beach State in the title match.
Long Beach State was attempting to become the first program to go undefeated in more than one season, as they went 36-0 just 3 years before in 1998.
On their way to the title, Stanford was able to knock off defending champion Nebraska in the national semifinals.
The other semifinal participant, Arizona, made the program's first NCAA Final Four appearance.
The win gave Stanford head coach John Dunning, who was in his first year as Stanford's head coach, his third NCAA title as he won two with Pacific in the 1980s.
This was the first year of rally point scoring in the NCAA Division I tournament, with games going to 30 points to win.
Previous years used the side out scoring (SOS), with 15 points needed to win.
Games became "sets" in 2008 and were reduced to 25 points to win.  
In order to complete a round, a player must play all the sets from their hand and finish with discarding a tile.
The other players receive penalty points.
When a player finishes their hand they receive 101 minus points.
The other players receive penalty points according to the total value of all of the tiles left in their hand.
If they have not opened yet they automatically receive 202 penalty points instead.
If a player finishes their hand by discarding the joker all points get doubled instead.
The player the finished receives 202 minus points and players that haven't opened receive 404 penalty points.
If a player has opened with doubles instead of sets the points also get doubled at the end of the round.
If he finishes his hand other players receive double penalty points.
If another player finishes the round, the player that opened with doubles receive double the value of their remaining tiles in penalty points.
If a player finishes their entire hand in one turn when none of the other players have opened yet all points get doubled as well.
Points get doubled again if the player is also able to finish with a joker as well.
In this case, the player that finished receives 404 minus points and all other players receive 808 penalty points.
When all of the rounds have finished, all penalty and minus points of all of the rounds are added together and the player with the least amount of points is the winner. 
  There are three styles of play.
"Heads Up": Two players, one on one.
"Cut-throat": Three players, in this game after a player wins the bet and calls the Trump, the other two players form a temporary unspoken truce to try to 'Shoot' the bidder.
Players who do not honor this truce are seen as selfish and called 'Nickel Grabbers' (each 'Trick' is worth 5 points).
"Five-Way Cut-throat": Similar to normal 3 man cut throat.
In this game it is much harder to make your bid as it tends to be 4 vs. 1 and the bidder is often shot.
"Partners": Either four or six players, with partners sitting opposite.
Partners points are pooled towards overall score, and towards bid.
Cards are dealt the same as in Forty Fives except that three cards are dealt to the "kitty" after each player has their first three cards.
(Games are often played 'No Kitty' and are considered to be more legitimate)  The game play and ranks of cards is the same as Forty Fives.
Instead of the top card being turned over after the deal and determining trump, players bid based on the strength of their hand.
Bidding is done before a trump suit is declared.
Players bid 15, 20, 25, or 30 points based on how many points they think they can earn with their hand if they get to call the trump suit.
Bidding goes in the same order as the deal.
If no one bids, choosing instead to pass, then the dealer automatically bids 15 and play resumes as normal.
When this happens the dealer is said to have been "bagged".
The player who wins the bid announces the trump suit.
After trump is called (it is important for trump to be called prior to this step), the person who called trump adds the kitty to their hand.
The bidder must have at least one trump card to call a given trump.
Players then discard any unwanted cards (usually non-trump suited cards except for the Ace of Hearts).
If it is a six player game, then each player must keep a minimum of two cards to ensure cards don't run out.
In a five player game they must keep at least one card.
The winning bidder may not keep more than five cards.
In the same order as the original deal, the dealer replenishes each player's hand so that all players have five cards.
The person to the immediate left of the winning bidder plays first.
The first card thrown is said to have been "led".
If the card led is in the trump suit, then each player must play a card of the trump suit if possible.
The Ace of Hearts is always considered part of the trump suit.
If a player breaks this rule they are said to have "reneged".
The winning bidder does not have to lead play with trump suit nor do players have to lead with trump suit when they lead a trick but players must play trump suit if a trump suit card is played in the trick and they have a trump suit card remaining in their hand.
When points are counted at the end of the round, the winning bidder adds their point total only if it equals or beats their bid.
If they do not "meet their bid" they instead subtract their bid amount.
This is known as being "set", "shot", or "setting the bidder" The object for the players that did not win the bid, therefore, is to make as many points as possible while at the same time preventing the bidder from making their bid.
The trick with the highest ranked card of the hand is the bonus trick, and is worth 10 points.
A player who is within 30 points of 120 is said to be "on the green".
This means they are one hand away from winning the game.
120 points wins the game.
Winning the game is referred to as "going out".
If multiple players go out on the same hand, then the player who bid that hand wins.
This is referred to as "Bidder goes out".
Points are added from round to round until a player or team reaches 120 and wins  If the bidder obtains or exceeds his bid his score increases by that amount, if he fails to reach his bid his score is reduced by the amount of the bid.
The object for the players that did not win the bid, therefore, is to make as many points as possible while at the same time preventing the bidder from making their bid.
Once a player or team reaches 100 points they must win the bid to receive points.
The other players will go up or down but they will stay at the same score.
They are locked in at that score unless they win the bid.
Once they win the bid they will either win the game or go down depending on if they make the bid or not.
This encourages the remaining players to bid against a player who is approaching 120, so that he will rarely be able to win the bid cheaply.  
All bids have a form of two distinct bids — for trump games a single value bid where the trump is either Acorns, Bells or Leaves (but is not announced during the auction) and a double value bid where the trump is Hearts.
In the latter case the suffix "of Hearts" is appended to the bid.
The suit of Hearts itself bears no other distinction in the game, however, by naming the trump during the auction the player gives away information and is thus slightly disadvantaged.
In no-trump games such as Betli or Plain Durchmars the double value form of the bid is merely an identical, second stage which helps the auction keep going for higher bids.
Betli and Durchmars also have an additional form called Open.
When playing an Open bid all players put their cards on the table and show it to the others right after the first trick.
Professional players usually end the game after "opening", as they inspect the hands and conclude whether the calling player would win or lose the game.
Open bids are worth quadruple the base value of Betli and Plain Durchmars, and double in Trump Durchmars.
Bids can be freely combined as long as they make sense, as shown on the figure.
The value of a combined bid is the sum of the individual components' values.
It is important to note, though, that at the conclusion of the game the constituent bets are evaluated and scored independently.
A 40-100 Durchmars Ulti therefore nets 4+6+4=14 points if all undertakings succeed and 4−6+4=2 points if the Durchmars happens to fail.
Doubling is done component by component as well, meaning that if a defender successfully doubles Durchmars in the above example the net result of the round is 4−12+4=−4 points.
Ulti is a unique bid in the sense that it carries an additional 4 points penalty if lost (8 for Ulti of Hearts).
Doubling, however, doesn't affect the penalty so a doubled and lost Ulti of Acorns costs 8+4 points for the bidder (16+4 or 32+4 if redoubled or surdoubled).
Ulti and Four Aces are worth an extra point (2 in Hearts) besides their standard value if they were not combined with any other bids as they implicitly get combined with a Simple.
Therefore the soloist should attempt to complete an extra objective in this case: to score more than the defending team.
However, since the constituent bets are handled independently, failing to complete the Simple does not cause the soloist to lose the bet but his winnings will be reduced by the value of a Simple.
The Simple component, like any component in any bid can be doubled separately.
Usually a player who bids a single value (non-Hearts) Simple forfeits the game doubled if no higher bid is made by anyone including himself.
This is done to prevent opponents from completing silent bids and to speed up the game playing more valuable bids.
In certain circles, forfeiting a simple is not optional but done by convention.
In the auction a bid is ranked above another bid if its total value is either higher than the other bid's, or is equal but made up of less components.
An Ulti (4+1 points) thus can be declared over a 40-100 (4 points) and a Betli (5 points) can be declared over an Ulti.
There is a single exception to this rule: although having the same total value and number of components, Ulti of Hearts and Four Aces of Hearts can be overbid by 40-100 Durchmars or Ulti Durchmars to facilitate playing more of these infrequent but arguably more exciting bids.
The following table recites all 54 possible bids in ascending order of value and precedence.
Alternating row colors represent increments in the 35-step bidding ladder as there are many combinations of equal value which can not be bid over one another.
The name Rebetli and Betli of Hearts are both commonly used, however, the latter suggests a trump suit despite Betli being a no-trump bet.
The misleading suffix merely points to the fact that the bet is double value and its use is advised against.