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Comment on "Mac OS X is Six Years Old Today"
by Scott Stevenson — Mar 24
@Michael Ellis: There's a lot of Mac OS stuff running on top of it, like Carbon, etc. but the OS itself and the core frameworks are NeXTStep
I think the problem was the use of the word "just." It's ultimately a matter of perspective. Apple didn't start from scratch -- they used an established and solid base. However, Mac OS X is pretty far from where NeXT would have ended up on a linear path.

Foundation is based on CoreFoundation, Quartz/PDF is used instead of Display Postscript, QuickTime was added, and a completely different user experience was implemented. Those are pretty big changes. However, the basic concepts that OpenStep was based on are still present, along with much of the plumbing.
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