Industrial relations reforms: boosting labour productivity?

Business leaders are citing impediments caused by the Fair Work legislation as a significant limit on labour productivity:

Mr Argus (former BHP Billiton chairman) ... warn(ed) of a return to "the dark days of the 1970s" if labour market flexibility was not boosted. He said under the Fair Work laws, unions were resisting "management attempts to achieve efficiency"... Bureau of Statistics data shows little change in labour productivity growth under the Fair Work Act when compared to the period under Work Choices, while other measures of productivity have also weakened since 2000.( ‘Labor woeful on economic reform, says Argus’)

The aim of such criticism, at a minimum, would be to widen ‘prohibited content’ in the matters addressed in enterprise bargaining, yet Australia has witnessed two decades of national industrial relations reform to make enterprise bargaining the centrepiece of our industrial relations system. It is thus reasonable to ask what were the IR reforms and have these influenced labour productivity?