The specific qualifications will vary depending on the field, but http://www.opm.gov/qualifications/index.asp outlines the requirements for all the appropriate fields.
The YA is the career classification system and is sort of a special category of the GS:
Some agencies have statutory authority to administer their own pay systems. Employees within these agencies...
First...you can't claim anyone that doesn't meet the qualifcations of a "qualifying child or relative". That includes having their ID and support for why they qualify...and they don't file or are...
The designator "IA" denotes the pay plan for the DCIPS Pay Bands. It applies to all positions included in the five pay bands of the DCIPS occupational structure. The Defense Civilian Intelligence...
This is the Department of Defense, National Security Personnel System payschedule. (YC) equates to a Standard Career Group Supervisor/Manager, Payband 3, Step 3 = YC 3/3