This publication presents estimates of apprentice and trainee activity in Australia for the September quarter 2016. Highlights include: (1) In-training as at 30 September 2016--There were 278,500 apprentices and trainees in-training as of 30 September 2016, a decrease of 5.7% from 30 September 2015; (2) Quarterly training activity--In the September quarter 2016, compared with the September quarter 2015: (a) commencements increased by 2.9%, to 37,800; (b) completions decreased by 15.6%, to 22, 800; (c) cancellations and withdrawals increased by 11.9%, to 25,300; (3) Training activity: 12-month ending series--In the 12 months ending 30 September 2016, compared with the 12 months ending 30 September 2015: (a) commencements decreased by 3.8%, to 169,700; (b) completions decreased by 18.4%, to 103,200; and (c) cancellations and withdrawals decreased by 3.3%, to 97 000. The figures in this publication are derived from the National Apprentice and Trainee Collection no. 90 (December 2016 estimates). The most recent figures in this publication are estimated (that is, for training activity from the March quarter 2015 to the September quarter 2016). Estimates take into account reporting lags that occur at the time of data collection. Consequently, the figures in this publication may differ from those published in earlier or later reports. The figures in bold are the actual numbers. Estimated data are presented on a quarterly and 12-month ending series basis. The 12-month ending series is particularly useful in showing longer-term data trends, but is less useful in identifying turning points. This publication also presents early trend estimates for the December quarter 2016 for seasonally adjusted and smoothed commencements at the national level for trades and non-trades occupations. Seasonal adjustment and smoothing involves the use of a mathematical model to smooth out fluctuations due to seasonal influences. These early trend estimates cannot be disaggregated further by state and territory. Note that the percentages presented in this publication are reported to one decimal place. All other numbers, after aggregation, have been rounded to the nearest hundred. Rounding can lead to instances where the numbers in the body of a given table might not add to the rounded totals. [For "Adjustment Notes for Apprentice and Trainee Estimates: September Quarter 2016. Support Document," see ED573504. To access "Apprentices and Trainees: Terms and Definitions. Support Document," see Ed573505.]