The biggest drag on Invensys before the Great Reorganization was the fact that they had a 27 year old DCS. Now there's no question that they tried to keep making new revisions, and producing new features, but it was the same vintage as ProVox, the TDC3000 and other systems that have been obsoleted and replaced by their vendors.
The truth is, that while the I/A system was in many ways at least a generation (25 years, eh?) ahead of its time, it has begun looking a little long in the tooth.
From
'Sound Off! Editors' Blog'