Next Visit, and an impact or a change set, i.e. all the components marked as 
Impacted or Changed. Impact Set Connections is an experimental analysis module evaluates the probabilities during Impact Analysis and Change Propagation stages of Incremental Change process.
In a nutshell, this module measures coupling between each component, marked as Next Visit, and an impact or a change set, i.e. all the components marked as Impacted or Changed.
More precisely, for each component, it is evaluated how many components, marked as , and members of these components, are either used by or are using this component or one of its members.
This is done with the idea that a higher degree of coupling may indicate higher probability of change propagation as indicated in [1]. However, it is useful to remember that this measure is very approximate and thus should be treated only as a hint rather then a precise indicator of the propagation.