That's a very good point, I've also tried to use a similar one with management and at presentations. There is a very good book that can underpin this argument. Code Simplicity in its third chapter introduces the equation of software design which includes the effort involved in introducing a change. Not surprisingly for us, it talks a lot about how much maintenance costs matter in those efforts. I think it even goes further than 60%, but the point is there.
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That's a very good point, I've also tried to use a similar one with management and at presentations. There is a very good book that can underpin this argument. Code Simplicity in its third chapter introduces the equation of software design which includes the effort involved in introducing a change. Not surprisingly for us, it talks a lot about how much maintenance costs matter in those efforts. I think it even goes further than 60%, but the point is there.