A review into an engineering body's decision to drop an investigation into an engineer whose firm designed the CTV building will begin on Monday.
In 2012, a Royal Commission criticised Alan Reay, the principal of the company that designed the CTV building which collapsed in the February 2011 Christchurch earthquake, killing 115 people.
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The commission said Mr Reay was at fault in giving responsibility to David Harding to design the building, claiming Mr Harding was working beyond his competence and made several fundamental errors.
Engineering body, Ipenz (now known as Engineering New Zealand), had considered laying a complaint against Mr Reay, who later resigned his membership from the group, but dropped the investigation in 2014 after taking legal advice.
In 2015, the National Government filed for a judicial review of that decision by Ipenz, arguing the body's investigating committee had misinterpreted the organisation's rules.
That review will begin on Monday, with Christchurch engineer Maan Alkaisi, speaking on behalf of the CTV families, claiming that the Ministry of Business, Innovation and Employment believes the decision was flawed.