Inheritance Anomalies (Matsuoka and Yonezawa)

• Sync. code are difficult to reuse as is.
• Implementation-side view.

Substitution Anomalies (Kuno :-)

• Type-compatible objects cannot be substituted each other due to differences in sync. behavior.
• Interface-side view.
  • Wider concept than inheritance anomalies.
  • More important:: substitutability is the heart of OOP.