You will often hear the terms "People Independence" or "Institutional Memory" used as a management reason for the creation of the huge volumes of paperwork often created in a BDUF (Big Design Up Front) project. The idea of course is that the presence of the documentation allows the organisation to use developers interchangeably.
For developers, documentation is extremely useful for the those who come after, even if it's you in 12 months time. This documentation however is only useful if it's up-to-date. Unfortunately in most cases it's written, read and never looked at again.
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