Lifetime dependency relationships and their application to modelling roles and relationship objects

  • J. J. Kaasbøll
  • R. Motschnig-Pitrik
Part of the IFIP Advances in Information and Communication Technology book series (IFIPAICT)


Techniques supporting early phases of the software life cycle aim to produce both easily comprehensible and truthful models of some problem domain, and such techniques thus depend on a proper choice of highly expressive concepts. One deficiency encountered in current analysis techniques is the lack of proper means to express inter-object relationships that result from dependencies of individual objects’ life cycles.

This paper introduces a relationship called lifetime dependency that captures frequently occurring behavioral constraints. It is argued on theoretical as well as on empirical grounds that incorporating lifetime dependency into object-oriented analysis models both improves their expressiveness and helps to keep the number of special purpose constructs such as role- and relationship objects small. We introduce notation to specify lifetime dependency and define a constraint that has to hold between the lifecycle of a lifetime depedent object and its required support objects. Furthermore, guidelines for detecting lifetime dependency relationships during the analysis phase are provided.


Object-orientation domain modelling requirements analysis design existence dependency pattern 


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Copyright information

© IFIP International Federation for Information Processing 1996

Authors and Affiliations

  • J. J. Kaasbøll
    • 1
  • R. Motschnig-Pitrik
    • 2
  1. 1.Department of InformaticsUniversity of OsloOsloNorway
  2. 2.Institute of applied computer science and information systemsUniversity of ViennaWienAustria

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