Check out Is Single-Sourcing Dead? by Mark Baker. Here is an excerpt:
Neil Perlin poses the question (and answers in the negative) in a response to my post “Time to Move to Multisourcing“. Perlin raises a number of points that deserve discussion. But first, a little clarification is needed. The term “single sourcing” is used to mean a number of different things in…
The full article is available here.