Guenther, R. S. (2004). "Using the Metadata Object Description Schema (MODS) for resource description: guidelines and applications." Library Hi Tech 22(1): 89-98.
According the Guenther's article, Using the metadata object description schema (MODS) for resource description, MODS is a reaction to the need for metadata which is richer than Dublin Core but more simplified and user friendly than MARC. This article focuses mainly on the user guidelines and applications, specifically the MINERVA project to collect and preserve materials from the Web.
The discussion of the user guidelines included a great deal of information about the relationship between MODS and MARC21. This specifically included sections on conversion (information that may be lost, etc.), elements that exist in MODS but not MARC, and fields that map from MARC to MODS. It also included information on the guidelines relating to aspects of MODS records such as punctuation, description of elements, notes, identifiers, etc.
Guenther's article included some examples of situations where MODS is being used. The majority of the examples involved some type of digital project, such as the LD Digital Audio-visual Preservation Prototyping Project, which is intuitive since one of the strengths of MODS is its ability to describe digital works.
The information on the MINERVA project was also very interesting. This section did a brief walk though of the project, enplaning the metadata which was to be created and where that information was taken from. This helped to give a picture of using MODS that was more concrete and less abstract than other examples and descriptions I have encountered thus far.
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