Inscriptions in the ETP corpus are assigned a number based on the date and time at which the inscription was entered into the system and then approved by the system administrator. This series number appears in the header of each catalogue entry. ETP editors are entering inscriptions into the system beginning with those recovered and/or made public after 1999, although the system administrator has approved a few inscriptions published before that date.

The major organizational schema of the ETP database is by Text Category. Inscriptions are entered into the database in one of ten epigraphic categories that correspond in large part to those categories widely recognized for the classification of Greek, Latin and Etruscan inscriptions. They are:

• abecedaria;
• artisans' texts;
• boundary markers;
• construction texts;
• dedications;
• didaskalia;
• funerary texts;
• legal texts;
• other/unclear texts;
• prohibitions;
• proprietary texts;
• religious texts.

Inscriptions within each Text Category may be viewed according to the date and time at which they were entered into the system. The ETP database may also be viewed in its entirety, again according to the date and time at which inscriptions were entered into the system, by clicking on the 'View All' button located in Search Options box. The database is constructed to permit the user to view inscriptions by other criteria as well.