This smell arises when client class uses explicit type checks (using chained if-else or switch statements that check for the type of the object) instead of exploiting the variation in types already encapsulated within a hierarchy.
Related smells: Switch Statement Type Queries
The following set of tools detects this smell: Designite(for C#) DesigniteJava(for Java)
All rights reserved (c) Tushar Sharma 2017-23.