“One of the greatest growing risks for mainframe systems is not the applications themselves, but rather the skills necessary to develop, maintain and operate them.”
Dale Vecchio, ‘Impact of Generational Skill Shift on Legacy Applications’, March 14, 2007. Gartner, Inc. ID G14006492

“Gartner strongly suggests that companies implement an application portfolio management effort to clarify the value, cost and risk of their situation and drive any modernization decisions. Using this strategy, organizations can prioritize their application workloads according to business need and technological status and make modernization decisions accordingly.”
Dale Vecchio, ‘Impact of Generational Skill Shift on Legacy Applications’, March 14, 2007. Gartner, Inc. ID G14006492