Sony says it made collaborating with partners a key priority during the development of NGP, noting that it went through "several iterations" of the platform as a result of feedback. According to SCE Worldwide Studio boss Shuhei Yoshida in a recently published interview, this approach is reminiscent of the stance the company took when designing the PSOne:
The input of other developers outside of WWS has been essential for us to make final decisions on NGP[...]
Continue reading: Sony: We've Gone Back To Basics, NGP Marks A Return To PSOne Era Attitude...