This feedback loop is a key element of TSE as stakeholder values may change as portfolio options and tradeoffs are made clear. Finally, processes 7 through 11 support designers at the portfolio-level to compare the dynamic properties of potential portfolios in light of their anticipated performance in a variety of point futures (epochs), as well as possible lifecycle narratives (eras). These processes are described and applied to the CSG study in section 4 of this paper.