The goals of the Photovoltaic Manufacturing Technology project (PVMaT) are to help the US PV industry improve photovoltaic manufacturing processes and accelerate cost reductions for PV components and systems. PVMaT is in its ninth year of implementation, and subcontracts with industry have been completed from four solicitations for R&D on manufacturing process problems. We are in the second year of subcontracts for a fifth PVMaT solicitation. Based on the latest (1998) data from ten PVMaT industrial participants, the average direct manufacturing cost for these producers has been reduced by 29% - from $4.08 to $2.91 per peak watt since 1992 - and there has also been a more than five-fold increase in manufacturing capacity - from 13.1 to 73.3 MW. We believe R&D on manufacturing processes contributes significantly to expeditious reductions in PV manufacturing costs, and we identify areas for future R&D. (C) 2001 Elsevier Science B.V. All rights reserved.