Shugart, Chris. 2006. Quantitative Methods for the Preparation, Appraisal, and
Management of PPI projects in Sub-Saharan Africa. Midrand, South Africa: NEPAD.
"Key References: Value for Money Analysis"
Describes some methodological inconsistencies and challenges with the PSC—focusing on two related issues: which is the appropriate discount rate to use when calculating present values, and how the cost of risk should be considered.