Proportion Of Development To Maintenance Costs

Though every programmer I’ve ever met knows that more money and time is spent maintaining software than developing it, finding a reliable source took quite a bit of Googling. Robert Glass wrote an article, ‘Frequently Forgotten Fundamental Facts about Software Engineering’ in IEEE Software (vol. 18, no. 3, 2001, pp. 112, 110–111) in which he states

“Maintenance typically consumes about 40 to 80 percent (60 percent average) of software costs. Therefore, it is probably the most important life cycle phase.”

The full article is helpfully reprinted on the IEEE’s site.

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