The reduction of an ionic/covalent compound creates metal. When this compound precursor is insoluble in the reducing electrolyte, the process proceeds like dealloying, and so does its morphology evolution. In this talk, we will discuss our work on nanoporous metal formation via reduction-induced decomposition. By comparing nanoporous Ag structures from decomposition of AgCl crystals and dealloying of AgZn alloys, we will show how they share many structural characteristics, including their bi-continuity, porosity, and coarsening behaviors. We will also discuss the differences between the two processes, which are manifested in the morphology. In particular, we will discuss the formation of new grains in decomposition, and the role of dissolution-redeposition in shaping decomposed structures distinct from their dealloyed counterparts. We believe that decomposition will provide a low-cost, versatile method for fabricating an even wider range of nanoporous metals with additional degrees of structural tunability not yet achieved by dealloying.