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Skill（技能）是一系列可供學習的能力，Skill等級愈高代表角色愈擅長作這類事。遊戲中可以透過升級與閱讀書籍來獲得Skill點數。
在Fallout 4和Fallout: Brotherhood of Steel中，Skill系統被併入Perk系統中。They are not listed here for this reason.
List of skills
Combat skills
| Skill | Fallout | Fallout 2 | Tactics | Van Buren | Fallout 3 | New Vegas |
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| Big Guns | 
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| Small Guns |
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| Firearms |
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| Guns |
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| Energy Weapons |
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| Throwing |
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| Traps |
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| Explosives |
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| Melee Weapons |
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| Unarmed |
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Active skills
| Skill | Fallout | Fallout 2 | Tactics | Van Buren | Fallout 3 | New Vegas |
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| Doctor |
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| First Aid |
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| Medic |
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| Medicine |
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| Lockpick |
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| Security |
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| Repair |
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| Mechanics |
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| Science |
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| Sneak |
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| Steal |
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| Survival |
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| Traps |
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Passive skills
| Skill | Fallout | Fallout 2 | Tactics | Van Buren | Fallout 3 | New Vegas |
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| Barter |
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| Gambling |
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| Outdoorsman |
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| Pilot |
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| Speech |
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| Deception |
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| Persuasion |
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Mechanics
For most skills, the success of an action governed by one is determined by either directly checking skill level against a threshold or with a skill roll.
Rolls are used for most intrinsically random actions like hits in combat and random encounters.
With Speech, direct checks are used as well as rolls in Fallout and Fallout 2, with direct checks completely taking over in later installments, as the randomness that rolls introduce proved to be undesirable in dialogues and quests.
Skills governing the success of gameplay actions with low degree of randomness (like lockpicking) used rolls in classic games, too, but eventually switched to entirely different mechanics (see skill pages for details).
Skill roll
A skill roll (also called "skill challenge") emulates the way skill checks are done in traditional pen-and-paper RPGs.
A random number from 1 to 100 is generated. If it is lower or equal to the skill level, the action is a success. So, for an unmodified check, skill level is effectively a chance of success for a relevant action.
A check can have a modifier that the skill level is adjusted by for the purpose of the check. So a positive modifier makes the action easier while a negative one - harder. Combat skills use automatically calculated modifiers from e.g. the ambient darkness level. Modifiers for checks associated with specific object or logic (like a dialogue option) are set explicitly. Since skills can grow up to 300%, the hardest challenges can have modifiers of as much as -100.
Some skills also limit the success rate by 95% no matter what.
A few skills can also generate critical successes and critical failures. For combat skills, the effect is determined by Critical Hit tables and Critical Failure tables.
See also
- J.E. Sawyer's Fallout RPG skills
- Lionheart skills
- TORN skills
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