A group who codes programs without revision control is stupid. And crazy.
Seriously, what self respecting software developer in 2009 in their right mind would use a “shared network folder” approach in sharing code instead of opting for a VCS?!?!
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Here we come to the second important purpose of revision control, namely, to automate most of the processes involved in sharing work among multiple users. Those processes and the problems involved with them are neatly described in the SVN book. Just click the link and come back here when you’re done reading the chapter (saves me the copy-paste effort :P ).