Well, that was fun
Although each advanced class naturally builds from a certain basic class, every advanced class is available to all characters who fulfill the prerequisites of the class, regardless of what basic classes they have gained levels in. The associations between basic classes and advanced classes are summarized on the following table.
|Soldier; Martial Artist
|Field Scientist; Techie
|Field Medic; Investigator
|1 The given basic class provides the fastest path to both of the associated advanced classes, though not the only path.
[h=5]Qualifying for an Advanced Class[/h] Advanced classes are like basic classes, except that they have requirements that must be met before a character can attain 1st level in the class. A character who qualifies can choose an advanced class as an additional class as he or she gains levels, using the multiclassing rules. Some combination of base attack bonus, feats, and skill ranks determines whether a character is eligible to gain a level in an advanced class.