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This chapter discusses applications, mostly circuital, of structural models for multielectrode systems using the finite difference method. For detailed studies of subtle parameter variations in structures, a high-resolution grid is needed. Detailed studies involving high-resolution grids are time consuming; having to solve three sets of equations for each case takes even more time. This problem can be reduced to solving only two sets of equations very easily by taking advantage of the property of linear systems, called superposition. The chapter also shows how to handle a floating electrode in a relaxation solution.