numerical  subject  groups  are  not  subdivided Tertiary Numerical below  the  primary  breakdown  because  of  the Subject Groups limited  scope  of  the  major  subject  group. Primary Numerical Subject Groups Tertiary   (third   or   additional   breakdown) numerical  subject  groups  are  indicated  by  the  last Primary  numerical  subject  groups  are digit  (the  ones  group)  of  the  four-  or  five-digit designated by the last three digits (the hundreds major numerical subject groups. For example, the tertiary   subject   groups   for   the   5230   series group)  of  the  four-or  five-digit  major  numerical (Automatic  Data  Processing  and  Information subject groups. For example, the primary subject Systems) are: groups for the 1000 series (Military Personnel) are: NUMBER SUBJECT NUMBER SUBJECT 1100 Recruiting 1200 Classification  and  Designation 5231 Data  Systems  Development 1300 Assignment  and  Distribution 5232 Evaluation  and  Review 1400 Promotion   and   Advancement 5233 Installation  Management 1500 Training  and  Education 5234 Software  Standards 1600 Performance  and  Discipline 5235 Data  Elements  and  Codes 1700 Morale  and  Personal  Affairs 1800 Retirement 1900 Separation Secondary  Numerical Subject Groups Primary  numerical  subject  groups  are  sub- divided  into  secondary  subjects  by  the  last  two digits  (the  tens  group)  of  the  four-  or  five-digit major numerical subject groups. For example, the secondary   subject   groups   for   the   1500   series (Training  and  Education)  are: NUMBER SUBJECT 1510 1520 1530 1540 1550 1560 1570 1580 1590 Enlisted Training Officer   Training Officer  Candidate  Training Functional  Training Instruction Courses and Training Materials Voluntary  Education Inactive  Duty  Training Interservice Training DANTES  Testing 3-8 5236 Procurement of Automatic Data Processing  Resources 5237 Reutilization and Sharing 5238 Resources  and  Accounting 5239 Data  Transmission  and  Pro- tection Arbitrary (Local) Subject Groups The  standard  subject  identification  codes (SSICs) listed in SECNAVINST 5210.11 identify the most frequently used subjects in the Depart- ment  of  the  Navy.  Local  commands  are  author- ized  to  further  subdivide  particular  subject  groups in  order  to  make  their  filing  systems  more efficient. Guidelines for making arbitrary (local) subdivisions   are   contained   in   Enclosure   1   of Classifying  and  Filing  Navy  and  Marine  Corps Records  (SECNAVINST  5211.3). Arbitrary  subdivisions  may  be  used  as  long  as they  are  logical  and  systematic,  follow  a  standard classification number or name-title code, and are separated from the basic SSIC by a slant (/). The slant makes them readily distinguishable from the standard  subject  identification  code.