Analyzing the components of Wednesday's trade that brought Jermaine Dye to Oakland:

To the A's:

Jermaine Dye, RF
What's to gain: The 27-year-old Dye turns the A's outfield from disappointing to dangerous. When he's on, he can do equal damage to lefties and righties, home and away. His quick swing pounces on fastballs. Defensively, he's one of the best around with a strong arm and good instincts. He's signed through next season.	Jermaine Dye(AP)
What's to lose: Dye has hit an anemic .275 with 13 homers. He went 3 1/2 weeks between home runs in May. If he plays badly, the A's will look bad in the deal. If he plays well, they might not be able to re-sign him after 2002.
What's his role: Dye will likely stay in right field rather than play center, moving Terrence Long to left and forming a quality outfield combo with ex-Royals teammate Johnny Damon. He'll also be counted on to provide Jason Giambi some insurance in the lineup.

To the Royals:

Neifi Perez, SS
Neifi Perez(Allsport)	What's to gain: The National League's defending Gold Glove shortstop on the verge of his first .300 season. This season saw Perez leading the National League in hitting at one point while providing his typical run production at a pace of 70 RBI. His defense is based on his athleticism.
	What's to lose: Payroll space. Perez could make $5 million next season, which was too much for the generous Rockies. How can the Royals make it work? Perez hitting away from Coors Field is also in question; he hits well over .300 at home and around .250 on the road.
	What's his role: Perez will take the job of soon-to-be free agent Rey Sanchez, who figures to be traded.

To the Rockies:

Jose Ortiz, 2B
Jose Ortiz(Allsport)	What's to gain: A potential five-tool player. The defending Pacific Coast League MVP had the starting job at second base out of spring training after smacking 24 homers and 108 RBI last year at Triple-A.
	What's to lose: Ortiz's numbers last year defied a track record of above-average offense for a middle infielder. His numbers this year aren't quite that powerful. He struggled in April at Oakland.
	What's his role: Team with shortstop Juan Uribe for a new Rockies middle infield. He would make a nice fit between leadoff man Juan Pierre and the heart of the Colorado order.

Mario Encarnacion, OF
Mario Encarnacion(Allsport)	What's to gain: A potential-laden outfielder who can hit for power and average when he's selective at the plate. He has established a pattern of hitting around .280, homering 15-20 times and driving in 60-70 runs a season in the minors. He has the range for center field and the arm for right.
	What's to lose: The A's have waited for Encarnacion to reach their outfield but injuries to his wrist and hamstring have slowed his progress at Triple-A. He strikes out way too often for a player with his limited power.
	What's his role: Push his way through the Rockies' crowded outfield -- that means you, Juan Pierre -- if he makes the right impression, or continue working on his game at Triple-A and wait for an injury.

Todd Belitz, LHP
Todd Belitz(Allsport)	What's to gain: A throw-in middle reliever with the ability to strike out hitters. Belitz has a decent fastball and a slider that goes inside on right-handed hitters. He adds a tough mentality.
	What's to lose: Belitz has five major-league appearances to his credit at age 25. His 5.13 ERA at Sacramento is bad even by PCL standards.
	What's his role: Keep the slider down and work inside. If Belitz can't break into the Rockies bullpen, he'll need a new line of work.