Skilled

Skilled is a trait which appears in Fallout, Fallout 2, Fallout: New Vegas add-on Old World Blues, Fallout Tactics, Van Buren, J.E. Sawyer's Fallout RPG and Lionheart.

Effect
You gain +10% to all skills but gain a perk only every 4 levels instead of 3.

Effect
You gain +5 skill points per level but gain a perk only every 4 levels instead of 3.

Old World Blues
"You're skilled, but not experienced. You gain +5 points to every skill, but you suffer -10% from experience gained from now on."

- Fallout:New Vegas description

Effect
You gain +5 to all skills but you suffer -10% whenever you earn experience points.

Exploits

 * If you use this at the beginning of the game, you will have the normal effects. However, if you reapply it before going into the wasteland, the positive effect doubles. Fortunately, the negative effect does not double, but the -10% remains.

J.E. Sawyer's Fallout RPG
You gain an additional Tag skill. However, you gain -1 skill points every level because you often spread yourself too thin.