The Three Speeds are a simple and effective model to think about collaboration strategy, adoption and tool selection for companies. From a talk I gave at MEX 2013 (London). Here one of the examples I gave, about Atos switching away from email: http://www.ft.com/cms/s/0/11384220-8761-11e2-bde6-00144feabdc0.html#axzz2fv5QOuzH