The capability tree for the CSG case study attests to the inherent complexity of portfolio analysis. For while the representation of the CSG has been simplified, the corresponding capability tree developed contains five branches (corresponding to the five portfolio-level performance attributes from process 2) and, through up to four levels of decomposition, 91 distinct system-level performance attributes. For the sake of brevity, the entire capability tree has not been included in this paper; however, Figure 5 displays the tree with all but the system-level performance attributes included. It should be noted that some branches terminate after only the portfolio-level attributes, while other branches decompose capabilities through three nodes before reaching system-level attributes.