Our recommended approach to economic valuation to influence decision-makers on investment in wastewater treatment follows the three-phased approach recommended by Waite et al., 2014 in Coastal Capital: Economic Valuation for Decision-making in the Caribbean – (1) Scoping; (2) Analysis; and (3) Outreach and communications (see Figure 1). This section of the report (Part II: Economic Valuation Methodology Guidance) is intended to lead valuation practitioners through the scoping and analysis phases.