This document covers the data terms used in the Apprentices and trainees December quarter 2009 report and its associated data tables. The primary purpose of this document is to assist users of the report to understand the specific data terms used within it. Terms that appear in the report are listed in alphabetical order with the following information provided for each: (1) Definition: a brief explanation of the term; (2) Classification categories: defined categories that apply to each term are listed where applicable; and (3) Source: a description of the source of this information, including details of any calculations or derivations. Training packages grouped by industry skills councils is appended. [For the accompanying report, "Apprentices and Trainees: December Quarter, 2009", see ED510135.]