Abstract
Inheritance is one of the key concepts in object-oriented programming (OOP). However, the usefulness of inheritance in concurrent OOP is greatly reduced by the inheritance anomalies. These anomalies have been subjected to intense research, but they are still only vaguely defined and often misunderstood. In this paper we show that concurrency is not the real cause of inheritance anomalies. We formally define the inheritance anomaly as a relationship between inheritance mechanisms and behavioural hierarchies. Our framework can be used to analyse the occurrence of inheritance anomalies in many different paradigms. A formal definition of the problem and a clear exposition of its causes are pre-requisites for a successful integration of inheritance and concurrency.
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