The head of the government commissioned audit of the NBN has called for all public infrastructure projects costing more than $1 billion to be subject to a cost-benefit analysis prior to the commencement of construction.

Former Telstra director and ex-head of the Productivity Commission Bill Scales found that the NBN’s establishment had been “rushed, chaotic and inadequate,” and recommended extensive changes to the process by which infrastructure mega projects are examined and approved. According to Scales, the policy for the multi-billion dollar project passed through only 11 weeks…