Data relating to cost of communication referenced on this site were taken from:

• David Grossman: http://www.holmesreport.com/latest/article/the-cost-of-poor-communications
• Pulse of the ProfessionTM In-Depth Report: The Essential Role of Communications – http://www.pmi.org
• PMI: More Than Half of All Project Budget Risk is Due to Ineffective Communications – http://www.pmi.org