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In the end the original goal of the Deity project of replacing the dselect user interface (UI) was a failure.
Work on the UI portion of the project was abandoned (the UI directories were removed from the CVS system) after the first public release of apt-get.
Ultimately the name was proposed on IRC, accepted and then finalized on the mailing lists.
This allows administrators to ensure that packages are not upgraded to versions which may conflict with other packages on the system, or that have not been sufficiently tested for unwelcome changes.
In order to do this, the pins in APT's preferences file ( APT front-ends can list the dependencies of packages being installed or upgraded, ask the administrator if packages recommended or suggested by newly installed packages should be installed too, automatically install dependencies and perform other operations on the system such as removing obsolete files and packages.
This can downgrade a package and render dependent software inoperable, so the user must be careful.
Finally, the mechanism allows the user to create an alternative installation policy for individual packages.