The twentieth meeting of the CGIAR Private Sector Committee was held at the Business Centre of the Hotel Sheraton Centro Historico in Mexico City, Mexico, on October 22nd, 2004. All the members were present. PSC Chair, Usha Zehr, conducted the meeting. Agenda items included: challenge programs, scientific know-how and exchange programme (SKEP), alliance-building initiatives, proposed workshop between the PSC and the CGIAR Centres, and external review of partnership committees. This document was discussed at the stakeholders meeting at AGM2004.