As noted in the previous issue of this publication, Experimental Estimates for the Manufacturing Industry, Australia, 2008-09 (cat. no. 8159.0), use of a regression model may introduce bias. While it is not possible to calculate the size of the modelling bias, a comparison of 2006-07 experimental ANZSIC class estimates with the official ANZSIC class estimates published in Manufacturing Industry, Australia, 2006-07 (cat. no. 8221.0) did not indicate obvious systematic error or bias.