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Models for Feature Descriptions and Interactions

The problem of feature interactions in telephone-and other software systems ((13]) has been identiied as being of great importance, but its solution remains elusive. In recent years, amongst others, several formal approaches have been tried, but the use of formal methods has met with limitations and even criticism. This criticism is discussed in more detail, and two modelling approaches, viz. Interworkings and Timed Frames are proposed that (partially) meet the objections. The models are illustrated with examples. The paper concludes with directions for future work.