The CTV stage of the royal commission of inquiry is expected to wrap up today after eight weeks of evidence.
The complex pancaked during the February 2011 quake, killing 115 people.
Serious design flaws have been highlighted by Stephen Mills, QC, counsel assisting the commission.
But claims of design faults are being disputed by the lawyer for the building's designers, Alan Reay Consultants.
CTV families spokesperson Peter Brown says most of the families aren't looking to blame.
"A lot of people are maybe looking for blame, but it's more understanding what happened and why it happened. I think the why is perhaps the thing in most people's minds."
He says the families hope lessons are learnt to stop another similar tragedy happening again.
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