Mediator
Managing many-to-many relationships in classes can be a complicated prospect. Let's consider a form that contains a number of controls, each of which wants to know if other controls on the page are valid before performing their action. Unfortunately, having each control know about each other control creates a maintenance nightmare. Each time a new control is added, each other control needs to be modified.
A mediator will sit between the various components and act as a single place in which message routing changes can be made. By doing so the mediator simplifies the otherwise complex work needed to maintain the code. In the case of controls on a form, the mediator is likely to be the form itself. The mediator acts much like a real life ...
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