How do I set permissions for a directory so that files and directories created under it maintain group write permissions?

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http://unix.stackexchange.com – I have a directory in which collaborative files / directories are stored. Say directory abc is owned by root and the group is project-abc. I'd like for this directory to have the following: Only members of group project-abc are allowed to change the contents of this directory. Files added to abc must have read and write permissions set for members or group abc Directories added must have read, write and execute permissions for group abc This is straightforward for static directories, but the contents of this directory are expected to change quite often. What's my best approach to produc (HowTos)