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From AGEWiki

Abilities that upgrades an Element (Model) or give increases in experience (XP) to Elements.

The appliance level is usually 'Leader' or 'Group'.

The parameters used in the ability:

• Param0 = XP Gain per turn
• Param1 = TechUpgPerc (PrimUpg): percent probability to upgrade an element to it's Tech upgrade model
• Param2 = TrainUpgPerc (SecUpg): percent probability to upgrade an element to it's Training upgrade model
• Param3 = RetainPerc (% of XP retained if upgraded)
• Param4 = CanUpgLeader (default 0, you can't upg leaders. Set = 1 to also upgrade leaders)
• Param5 = CanUpgSubUnit (default 1, you can upg sub-units (models))
• Param6 = MinExpForUpg (min nb of experience levels for the upg check)
• Param7 = MaxNbSUUpg (max nb of successful upg (elements) that can be done per turn)

Example (from Wars in America):

Training_Officer
"Will train up to two regiments of conscripts to regular soldier every turn."

Appliance = Group
Param0 = 0
Param1 = 0
Param2 = 100
Param3 = 50
Param4 = 0
Param5 = 1
Param6 = 0
Param7 = 2

A leader with this ability anywhere in a group (Appliance = Group) will train up to
2 elements (Param5, Param7) to their Primary Upgrade model (Param 2: 100% certain)
with a 50% change to retain Experience already earned (Param3). 
Leaders are not upgraded (Param4)

Note: Only models with a defined upgrade (PrimUpg in Models DB) will be trained.