Providing some tips for reducing the number of edge loops in a model, Jamie Hamel-Smith shares some strategies for maintaining good geometry with a demonstration of couple of simple techniques.

how you can take a loop with an even number of edges, and easily reduce the number of edges therein

Jamie shows how you can take a model with an even number of edges, easily reducing them down while still maintaining the shape of the form, and as a bonus, also maintaining quadrangles while doing it. Check out the tutorial for Reducing Loops of Edges in Cinema 4D here.