Before revision:  One of the most important issues encountered when modeling bipartite networks is devising a way to obtain a (monopartite) projection on the layer of interest, which preserves  the information encoded into the original bipartite structure as much as possible .
After revision:  One of the most important issues encountered when modeling bipartite networks is devising a way to obtain a (monopartite) projection on the layer of interest, which preserves the information encoded into the original bipartite structure .