Source: http://www.theaustralian.com.au/arts/re ... 105976bbe6“Initially it was Pixar teaching Disney how to do it but we only did that for a year and a half and then Disney got going,” Catmull says.
They were kept separate for years until Pixar was “a little stuck” with Inside Out. The Disney Braintrust “looked at the film and they helped pick at a problem that was in the way. As soon as we heard [their answer], we realised it was true and ‘oh, we’ve got two groups of people who like each other, they want each other to succeed, they speak the same language, they know what it means to give meaningful notes and they’re fresh eyes’.”
Later, the Pixar Braintrust found two flaws holding back Zootopia.
“Then I realised not only do we have a Braintrust, which is unique in the industry, but we have two of them,” Catmull says with a laugh. “And it gives Disney an incredible strength to have two groups, who once per film can give feedback to the other — and only once per film, because no longer are they fresh eyes.”
Via: http://www.pixarpost.com/2016/03/pixar- ... .html#more