The buttons featured are for the Xbox version of the game!

Basic Moves
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Crouching

Press the B button to crouch. Movement is slower, but
quieter, and Sam is less visible while crouched.

Mantling

Press the Y button and push forward into low objects like crates or
tables and Sam will crawl, or 'mantle' onto them.

Climbing

To Climb a pipe, ladder, vertical cable or fence simple walk into it.
Press the B button to jump off.

Close Attack

In Splinter Cell Chaos Theory, you choose between lethal (right trigger)
attacks and non-lethal (left trigger) attacks when you're close to the
enemy.

Back To Wall

Click the left thumbstick when standing or crouched to put Sam's back to
wall. Sam is less visible with his back to wall.

Shimmying

Jump by pressing the Y button to grab and hang from ledges above Sam's
head. Sam can move left and right as well as pull himself up if there is
room.

Hand-over-Hand

Jump by pressing the Y button to grab and hold a horizontal pipe. Bring
Sam's legs up to clear obstacles by pressing the Y button.

Inverted Neck Snap

When holding onto a horizontal pipe with legs up. To attack a non-player
character (NPC) press the right trigger for a lethal attack and the left
trigger for a non-lethal knockout attack. Press the B button twice to
let go.

Zip Line

Jump by pressing the Y button to grab hold of a sloped wire or zip line.
Sam will slide down automatically, Raise Sam's legs by pressing the Y
button. Press the B button to let go.

Throwing

Once Sam has an item in hand, press the X button to enter throwing mode.
A reticule appears in the middle of the screen. Aim the reticule at the
position you want to throw the object. Pressing the right trigger will
throw the object. Sam can throw objects or grenades he picks up in the
environment.

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Advanced Moves
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Rolling

Press and hold the B button while running to do a roll.

Split Jump

If Sam is in a corridor that is not too wide but relatively high,
he can perform a split jump by facing the wall and pressing the Y button
to jump.

Half Split Jump

If Sam is in a smaller corridor, he will be able to do a half split jump.
Press the Y button to jump will make Sam enter the half split jump mode.

Drop Attack

If you get above an enemy and drop down on him, you will be able to knock
him out.

Rappelling

To rappel, stand near the hook point indicated in the interaction window
and select the Rappel interaction. Sam can move up and down the rope.
Press the Y button to kick off the wall.

Rappel Shooting

Sam can equip and fire his weapon while rappelling. Press the X button to
equip the selected weapon. Only the pistol and SC-20K are usable while
rappelling.

Hanging Shooting

Sam can equip and fire his weapon while hanging from a pipe. With his
legs down, he will shoot forward; with his legs up, he will hang upside
down and shoot backward. Press the X button to equip the pistol while
hanging from a pipe.

Split-Jump Shooting

Sam can equip and fire his weapon while in the split jump position. Press
the X button to equip the selected weapon.

Switch Shoulder

While in the aiming mode, click the left thumbstick to switch your weapon
form one shoulder to another. That way you will be able to aim at any
angle.

Bash Door

When you shoos Bash Door in the interaction menu, Sam will break through
to another room by hitting the door with his feet. Note that this move
will make more noise, but it can knock out can enemy on the other side.
Get your weapon before bashing the door, if needed.

Open Door Stealth

If you want to make sure no one hears you, open the door in a stealthy
way. You can make Sam open/close the door as fast as you want by playing
with the left thumbstick.

Lock Picking

Sam will need to pick the lock on some doors. lock picking takes time,
but is quiet and cannot be detected. To pick a lock, slowly rotate the
left thumbstick around the outer edge of its range until you see and hear
the first pin being to move. This means the left thumbstick is in the
correct quadrant. Then keeping the left thumbstick in the correct
quadrant, gently move the left thumbstick to release one of the pins.
Repeat until all pins are released.

Break Lock

If Sam is in a hurry, he can simply break locked doors open using his
knife, to do this, simply select break lock interaction. Beware... this
is noisy and broken locks will cause guards to become curious.

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Non-Player Character-Linked Moves
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Move Body

Sam will need to hide dead or unconscious bodies in order to prevent them
from being discovered. Select the body interaction to carry the body.
Press A button to put it down quietly, or simply press the Y button to
drop the body in a hurry.

Grabbing

Grab an enemy by sneaking up close to imp undetected and selecting the
grab character interaction.

Human Shield

While holding an enemy, you can press the X button to equip your sidearm
and fire at other enemies while using the enemy you are holding as a
human shield. Note that you can move around with Sam while in this mode.

Interrogation

Some NPC's can be interrogated for useful information. While holding an
NPC, select the interrogate interaction to make him talk. Interrogations
reveal all sorts of information that will help you on your missions. Be
sure to interrogate as many opponents as possible!

Forced Cooperation

Some objects in the world can't be used by Sam, but there may be NPC's
who can use the objects for him. To force an NPC to cooperate, grab him,
drag him to use and select the Force Cooperation interaction.