 Consequently, the model is able to at least partially explain the "small-world" phenomena in a variety of networks, such as the power grid, neural network of C. elegans, networks of movie actors, or fat-metabolism communication in budding yeast.Given the desired number of nodes formula_2, the mean degree formula_3 (assumed to be an even integer), and a special parameter formula_1, satisfying formula_5 and formula_6, the model constructs an undirected graph with formula_2 nodes and formula_8 edges in the following way