Even when a description attached to an ID changes, this change is usually accounted for during the development process.In a dynamically defined type table, values are usually modifiable by administrators.
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I'll concentrate on this kind of type table because it's prone to problems.
Dynamically defined type tables can present problems in relational designs.
Changing values can have a huge impact on reporting as well as data archiving.
In "The Trouble with Type Tables," I discussed the importance of creating type tables and how to set them up correctly in a normalized database structure.
One aspect that I didn't discuss is including columns in type tables for the purpose of effective dating (i.e., documenting when something goes into effect and when it's no longer in effect).