This smell arises when one or more types in a hierarchy are provided speculatively (i.e., based on imagined needs rather than real requirements).
Related smells: Speculative Generality
G. Suryanarayana, G. Samarthyam, T. Sharma, “Refactoring for Software Design Smells: Managing Technical Debt”. Morgan Kaufmann, 2014.
All rights reserved (c) Tushar Sharma 2017-23.