Sladescross's Blog

Blogging about Sharepoint related stuff

60/60 Rule May 23, 2011

Filed under: 60/60 Rule,Design Patterns — sladescross @ 10:34 am

Fully 60% of the life cycle costs of software systems come from maintenance,
with a relatively measly 40% coming from development. That is an average, of

The actual cost of maintenance may vary from 40% to 80%, depending
on the system type and the environment it is deployed into. During maintenance, 60% of the costs on average relate to user-generated enhancements (changing requirements), 23% to migration activities, and 17% to bug fixes. The 60% of life cycle costs related to maintenance, coupled with the fact that 60% of maintenance activities relate to enhancements, gives us the so-called 60/60 Rule, one of the few proposed “laws” of software maintenance.

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