This article, from Manufacturing Computer Solutions magazine, describes a successful implementation of TOC's manufacturing solution - Drum-Buffer-Rope (DBR).
The bit I like is that they had to turn off many of the clever features of their expensive state-of-the-art SAP software system and use a spreadsheet instead. Many companies are blindly using the off-the-shelf settings. The people doing this either (a) think the manufacturing paradigm implemented by the software is correct or (b) don't think about the manufacturing paradigm at all and assume that if it's in the software it must be good.
I guess the same could be said for how we build software.
Is the software development paradigm you use correct? How do you know? What do your customers think?
Where did you find your methodology? Did you buy it off IBM? Did you learn it while at programming school? Is it just what your company has always done?
Is there something better? Have you looked? Is it your job to look? Are you allowed to look? Is someone else looking?