This series contains memoranda sent and received by Directors of the International Economics Department (IECDR) regarding the Planning Assumptions Committee (PAC) and the process of revising PAC Baseline Numbers. The Planning Assumptions Committee met twice a year, in the spring and the fall, to review and validate Bank-wide planning assumptions about international prices (particularly of manufactures), interest rates, and related global indicators. These assumptions became the PAC Baseline Numbers that were used in various Bank projections, e.g. in setting price and interest rate guidelines for Bank project work. IEC served as the secretariat to the PAC; the Chief Economist was chair. The memoranda in this series concern ways to improve the PAC process and the methods used to develop the baseline indicators and plans to develop a downside scenario as an alternative to the Baseline Numbers for 1990.