Fallout skill books

General information
Skill books in the original Fallout can be used to increase the character's Small Guns, First Aid, Science, Repair and Outdoorsman skills. When a book is used, it is removed from the inventory and time passes.

The amount of skill points gained is equal to 100, subtract the current skill level, divide by 10, and then rounded down. Thus, the maximum a skill can be increased by books is up to 91%.

Maximizing skill point gain
Passive skills are lowered by 10% when the difficulty is changed from Normal to Hard. SPECIAL stats (Strength, Perception, etc) modify skills with a considerable bonus. The game keeps track of this bonus throughout the game, in real time. Any changes to stats, (e.g. chem effects) during the game add to or subtract from this modifier. It is thus possible to reduce any combination of stats to a minimum value, significantly lowering skill values.

This way it's possible to raise Small Guns to 100%, First Aid, Repair, and Outdoorsman to 110% and Science to 119%, in the case of a player whose Perception, Intelligence, and Agility are at 10. To lose Agility and/or Endurance, use Buffout, then wait six hours. To lose Intelligence and/or Perception, use Mentats and wait a day. To lose only Intelligence use Psycho. To lose only Perception, drink beer, booze, etc. If books are used from inventory (by left-clicking and dragging) rather than from a weapon slot, time will not pass, and therefore stat effects will not wear off until the inventory screen closes.

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