Tom Clancy's Splinter Cell: Double Agent

Ways to increase each of the stat levels.

Spy:
Athlete- Run around a lot, Dive by pressing and holding .

Sneak- Press  to crouch and sneak your way around the level. When sneaking you do not appear as a white outline on the Upsilon Forces screen.Turning off lights,neutralizing your enemy,and Securing files also helps.

Gadgets- The gadgets are the Flashbangs and Smoke grenades, Syringes, and Jammers. Using gadgets on your enemy raises this attribute.

Upsilon:
Direct Action- Kill the Spies as they take the file or when they have a full file.
Recon/Track- When the Spies move swiftly by you they appear as a white ouline on your screen, this is when you are tracking them. Using your hook to go over edges also helps.
Gadgets- Kill the spies with either drones or grenades.

TIP
Use friends to help boost you up an when it becomes tough just focus in on one type of stat.