Nice to Know:

Faction [Hardener To Use] (Ammo to use against):
* Angel [Kinetic/Explosive] (Explosive)
* Amarr Navy [EM/Thermal] (EM/Thermal)
* Blood Raiders [EM/Thermal] (EM)
* Sanshas Nation [EM/Thermal] (EM)
* Caldari [Kinetic/Thermal] (Kinetic)
* Concord [EM/All Dmg Types] (Thermal)
* Drones [All 4] (EM)
* EOM [Kinetic/Thermal] (Thermal)
* Gallente [Kinetic/Thermal] (Thermal)
* Guristas [Kinetic/Thermal] (Kinetic)
* Khanid [EM/Thermal] (Thermal)
* Minmatar Fleet [Thermal/Exp] (Thermal)
* Mercenary [All 4] (Thermal)
* Mordus [Kinetic/Thermal] (Kinetic)
* Serpentis [Thermal/Kinetic] (Kinetic)

** Targeting systems **
Minmatar - Ladar
Caldary - Gravimetric
Gallente - Magnetometric
Amarr - Radar



Pi guide:

http://bolvarion.blogspot.de/2011/12/planetary-interaction-pi-guide.html