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Two decades ago, I posted that I found that the strangler fig plant was an interesting metaphor for the gradual replacement of a legacy system. I didn’t refer to the metaphor since, but meanwhile it grew a life of its own. Other people increasingly referred to the strangler fig approach to modernization, and traffic to that post steadily increased: currently it gets about 5000 page views a month, one of the more popular pages on this site. So I decided I needed to update that page, and have rewritten it, focusing on the core activities we need to do to make a success of such a venture.
(This summarizes more detailed writing from Ian Cartwright, Rob Horn, and James Lewis.)
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