’Silo’ in Management Theory

choi

Management theory | Blighting the Horizon. Economist, Aug 29, 2015
www.economist.com/news/books-and-arts/21662486-blighting-horizon
(book review on Gillian Tett, The Silo Effect; The peril of expertise and the promise of breaking down barriers. Simon & Schuster, 2015)

Note:
(a) Regarding the “silo” in the book title.
(i) silo (n): "system, process, department, etc. that operates in isolation from others  <it’s vital that team members step out of their silos and start working together>"
www.oxforddictionaries.com/us/definition/american_english/silo
(ii) I have not seen this use / definition of silo before. The online Meriam-Webster dictionary does not have this definition. So I suspect this is British thing.

(b) “Lest this seem woolly, Ms Tett devotes another chapter to showing how silo-busting has created profitable trading opportunities for hedge funds that ignore the usual distinction between debt and equity analysis.”
(i) woolly (adj): “not clear[:] MAINLY UK [connotation:] DISAPPROVING[;] Woolly ​ideas and ​thinking are ​confused and not ​clear, and have not been ​considered ​carefully enough”
http://dictionary.cambridge.org/us/dictionary/english/woolly
(ii) Why?  I fail to find the origin of this definition.
(iii) However, the following is good enough.

woolly (adj): "4: fuzzy; unclear; disorganized"
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd
www.thefreedictionary.com/woolly