Report on the external reivew of the Sub-Saharan Africa Challenge Program, led by Dr. Cyrus Ndiritu. The basic findings of the Panel members is that while the Challenge Program has not met the main milestones set for the Inception Phase, there is evidence of progress towards the milestones to support an extension in order to address the original research question of the CP, i.e. the testing of the benefits of an innovative platform—the IAR4D concept—in designing and implementing research at the interface of productivity, environment, policy and markets that would increase demonstrably the delivery of the benefits to the end users. Thus, the Panel recommended an extension of the CP for 3 years. It does, however, add a number of conditions, one of which is to remain focused at three sites, and that the program strengthens the research planning and design and implements a process to ensure systematic monitoring and evaluation to develop IPGs. This report contains the Science Council commentary, FARA's response and the main review report and annexes.