The World Bank (WB) wanted to develop a conceptual framework for assessing, both qualitatively and quantitatively, the transaction or delivery costs of demand-side energy efficiency (EE) measures. The conceptual framework was meant to serve as the basis for an illustrative assessment of the first order range of such costs for selected demand side EE programs/technologies, in order to better inform policy makers about options presented in typical marginal abatement cost (MAC) curves. The specific outputs of the activity were meant to help: 1.) advance the understanding of the range, magnitude and implications of incremental delivery costs of demand-side EE; 2.) demonstrate the approach and provide directions about how EE delivery costs could be estimated using data from selected projects; and 3.) better inform World Bank project managers, other donors, and client governments on how to treat the issue of delivery cost of greenhouse gas (GHG) abatement through EE options.