HARVARDEDGE  WILLIAM AND MARY QUARTERBACK: In first two games Brian White hasn't lived up to preseason billing. Has .360 completion percentage and has lost 18 yards rushing. Does have experience and is talented. Look for him to open it up today. Can run and pass. Knows Multiflex.  *  QUARTERBACK: Senior Stan Yagiello (89-151-1216-8TDs-4INTs) is the be-all and endall for the Tribe. He holds every major W&M passing record. Against James Madison, he had 405 yards passing. The guy is good. Real good. The best Harvard will face all year. RUNNING 'BACKS: Robert Santiago might be the best in the Ivy League, but so far he's not even the best on his own squad. Rufus Jones leads all rushers with 87 yards, Santiago is second with 82. Santiago will be the key if Harvard has a shot today. Problem is, Santiago and Terry Denson are banged up. George Sorbara, Chris Ridout, Jones and Lamont Greer all have speed and give the Crimson its best ground attack in years. So far, though, the squad's best area has been one of its most disappointing.  *  RUNNING BACKS: Tailback Michael Clemons leads the team in rushing with 224 yards and four touchdowns and has 25 receptions for 254 yards. Clemons also returns kicks and had a 94-yard touchdown return. Could be the key. Fellow junior Reggie Hodnett is the fullback. A more than capable duo. RECEIVERS: Restic will shuffle his receivers, with Chuck Shirey--who also handles the punts--getting the starting nod. Lots of speed here, but ability is questionable. No Crimson wide out has ever caught a pass in a varsity game. No Crimson wider receiver has caught a touchdown pass in three years.  *  RECEIVERS: Wide Receiver Ron Gillam, who has four touchdowns receiving, is the top pass catcher and flankers Harry Mehre and Dave Szydlik are deep threats. Extremely talented group. Will test Harvard defensive secondary. OFFENSIVE LINE: Only George Kostakos returns from last year's starting unit. This group had difficulty getting untracked first two weekends. This is the squad's biggest question mark and potentially its biggest problem. Has made many mental mistakes. The key to the whole offense.  Even  OFFENSIVE LINE: One of the Tribe's question marks. It's a line that has an average weight of almost 250 lbs. Sophomore center Scott Perkins is the lightest, at 230, but he just might be the best. This is the key to W&M's fortunes. They'll need to keep the Crimson off Yagiello's tail. DEFENSIVE LINE: Bill Ross and K.C. Smith lead a unit that is the squad's most pleasant surprise. A question mark at season's start, this unit has played extremely well first two weeks. Hasn't allowed a touchdown in seven quarters. Hasn't allowed a score in second half of either game this year. Only potential problem is lack of depth.  Even  DEFENSIVE LINE: The leader of this group is defensive tackle Joe Monaco, who has 32 tackles so far this season. Rick Miller and Kevin Looney are adequate ends, and junior Jeff Heineman is a mammoth right tackle. An average unit. LINEBACKERS: The defense's strong point. Captain Brent Wilkinson leads this group, with returnees Scott Collins and Larry Bean providing strong support. Wilkinson was a madman a week ago, shutting down a strong UMass attack. He'll need to equal his effort today if Harvard is to have a shot.  *  LINEBACKERS: Middle linebacker Dave Pocta (56 tackles) is the heart of a defense that is tougher against the run than it is against the pass. Right linebacker David Wiley (38 tackles) is solid. Susceptible to the big play. Which might play into Harvard's fortunes. SECONDARY: Starters Cecil Cox and Ken Tarczy return from last year's squad. This group, which already has six interceptions on the year, will get sorely tested today. Has averaged three interceptions a game, with Lee Oldenburg coming up with two big ones a week ago.  *  SECONDARY: Senior cornerback Calvin Trivers, with two interceptions, is this unit's leader. Two seniors and two sophomores give this group an interesting blend, but its ability is still questionable. Has tendency to give up the long ball. KICKING GAME: Punter-placekicker Rob Steinberg has converted eight of eight PATs and one field goal attempt. No problem on kickoffs, either. Only problem area has been his punting, where he's lacked consistency. Needs one point to become 10th all-time leading scorer among Harvard kickers.  Even  KICKING GAME: Brian Morris, who has hit on three of five field goals and 12 of 13 PATs, is a four-year varsity kicker. That means he's got the experience. Plus he's good. The punter is senior Rod Lawrence and he's also good.