Assassin's Creed: Brotherhood/Scoring and leveling

As you play online, the scores you accumulate during a session get added to your profile as experience, which in turn increases your level. You start out as a Level 1 agent, and as you increase your level, you will unlock abilities, perks and other enhancements to your character. Scoring well within a session is the key to leveling up, and leveling up will make scoring easier.

Scoring
There are many ways to score during a session: You will see scores pop up on the screen as you earn them and at the end of the session your total will be shown in the Highlights tab. Go over to the Session Score tab to see a more detailed view of the scores you earned during the session. You can also compare your scores with other players in the session, with scores in green being greater than the player you're comparing against and scores in red being less than.
 * Kill targets
 * Escape or stun pursuers
 * Making streaks
 * Performing sessions actions
 * Performing cooperative actions

Leveling
You can check your progression in the Leveling tab of the menu to see your current level, the percentage completion of your current level and how much experience you need to gain the next level. In this screen you can also move through the levels to see what you will gain for attaining other levels and how much experience you need to attain other levels.