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"A change of management was the most common cause of IT failures"
https://www.theguardian.com/business/2019/oct/28/number-of-it-failures-at-banks-and-other-firms-is-unacceptable-say-mps
Though going back to the source, the wording is a little different: "change management" or "change of management"? https://publications.parliament.uk/pa/cm201920/cmselect/cmtreasy/224/224.pdf
From the report: "We also heard that the approach to change matters..."
Anne Boden, CEO of Starling Bank: Modern technology is now released and change managed by implementing a little bit of change often. By having a little bit of change [ ... ] and doing it several times a day, you minimise the impact of that change...
... We all know that when you do big change—big migrations, big separations of banks, and big migrations of systems—we put customers at risk.