Efficiency
There are many actions in Mush to which an efficiency is attached, given as a percentage. They can be classified into two categories:
- Progress actions, which are always successful, and are used for a greater task. The efficiency of all participants sums up, until 100% is reached and the task is complete.
- Random actions (repairing something, shooting someone, etc.), which may fail: the efficiency is the chance of success.
In both cases, the efficiency you get varies depending on many factors: the action itself, skills, items in inventory, broken equipment, etc.
Progress Actions
Main article: Relaying.
For several of such actions (Research, NERON Projects, PILGRED) the efficiency of any character drops after each progress, and is only reset to its base level when another character does the same action: relaying is thus needed.
Random Actions: Success Chance
In most cases, a failed random action will only generate a 
Private log but will, however, increase the efficiency by half or a quarter. The maximum efficiency is of 99%, meaning that a random action can always fail, even after 10 unlucky tries in a row.
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However, any other action consuming  will reset the efficiency to its base level. Including converting into  .
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- On the other hand, changing room when is available, lying down or eating do not consume and do not reset the efficiency.
It seems that unsuccesful repairs without tools increase previous efficiency by x1.5, while unsuccesful repairs with N tools increase increase previous efficiency with N tools by x1.25. As equipping two tools increases the base efficiency (no tools=base) by x2.25 and repairing with no tools increases the efficiency faster, it would be a good idea to start repairing items with very low initial efficiency without tools for quick growth of base efficiency, and then pick tools to get the x2.25 boost when base efficiency is 20-25% or higher.
TODO: anyone knows how to fill this table without testing each action?
| Action | Base chance (first try) |
Next tries | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 2nd | 3rd | 4th | 5th | 6th | 7th | 8th | 9th | |||
| Repair | 3% | Confirm: do alien TV and BIOS have the lowest repair chance ingame?
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| 6% | 9% | 13% | 19% | 28% | 42% | 63% | 94% | 99% | ||
| 12% | 18% | 27% | 40% | 60% | 90% | 99% | ||||
| 25% | 37% | 55% | 77% | 99% | Confirm: 77% should be 82% by multipliers
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| Repair with 1 tool | 9% | 11% | 14% | 17% | 21% | 27%? | 34%? | 42%? | (tested on research lab) Confirm: With multipliers & rounding, it should be: 9-...-21-26-32-40-60
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| 18% | 22% | 27% | 34% | 42% | 53% | 66% | 82% | 99% | Confirm: experimental numbers, test them
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| 37% | 46% | 57% | 71% | 89% | 99% | Confirm: experimental numbers, test them
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| Repair with 2 tools | 13% | 16% | 20% | 25% | 31% | 39% | 49% | 61% | 76% | Confirm: experimental numbers, test them
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| 25% | 22% | 27% | 34% | 42% | 53% | 66% | 82% | 99% | Confirm: experimental numbers, test them
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| 56% | 70% | 87%? | 99% | (first two tested on fuel tank) Confirm: 3rd try is a experimental numbers, test it
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| Turret: shoot | 30% | 45% | 67% | 99% | (tested) | |||||
| AstroTerminal: Scan | 80% | 99% | (tested) | |||||||
 Extinguisher:Extinguish
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50% | 62% | 77% | 96% | 99% | (tested) | ||||
 Hacker Kit: Hack
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25% | 31%? | 39%? | 49%? | 61% | 99% | Confirm: 2nd,3rd,4th are experimental numbers, test them
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| Kick Off (active target) | 60% | 75% | 92% | 99% | (tested) | |||||
