Freuder in (1991) defined interchangeability for clas-sical Constraint Satisfaction Problems (CSPs). Re-cently (2002), we extended the definition of inter-changeability to Soft CSPs and we introduced two notions of relaxations based on degradation δ and on threshold α (~δ neighborhood interchangeability (_αNI)and _α neighborhood interchangeability ~δNI). In this paper we study the presence of these relaxed version of interchangeability in random soft CSPs. We give a description of the implementation we used to compute interchange-abilities and to make the tests. The experiments show that there is high occurrence of _α NI and ~δ NI interchangeability around optimal solution in Fuzzy CSP and weighted CSPs. Thus, these algorithms can be used succesfully in solution update applications. Moreover, it is also showed that NI interchangeability can well approximate full interchangeability (FI).
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