The research work of Harvard professor Chris Argyris gave rise to much of what is today called Organisational Learning, an approach subsequently promulgated by Peter Senge and his team at the Massachusetts Institute of Technology. The first section of this paper argues the relevance of Organisational Learning to NGOs, despite its origins in the study of the private sector. The second section describes a particular project intervention based on Organisational Learning theory, which is currently underway in a Brazilian NGO.