Through a funded collaboration with the University of the Illinois at Urbana-Champaign and ICRISAT, SPIA organized a workshop on “Advanced Methods in Impact Assessment” on ICRISAT campus, Nairobi (Kenya) between 21st and 25th September, 2015. The workshop was well-attended by CGIAR scientists (including biophysical scientists) from CGIAR Centers and a few NARS partners from around the world. In many senses, this was a first of its kind, and like any event there are always challenges and lessons to learn. For instance, non-economists who use SAS, SPSS, and R found it trickier to use STATA – the preferred statistical analysis package of economists. Given the mix of disciplines in the room, and the objective to cover the full range of quantitative impact assessment approaches, there was little time to discuss some topics (regression discontinuity design and endogenous regression switching models) in-depth – a preference expressed by some economists.