A one-day workshop exploring the social aspects of informal value transfer at the European Complex Systems Society Conference, Lisbon, September 16th, 2010. ***Deadline for submissions: April 30th 2010 *** This workshop aims to promote inquiry into social phenomena that involve value-exchange, and in particular on networks for credit and value transfer, under the effect of recent technological and societal change. Informal value transfer and credit networks involve people or institutions providing credit or value transfer services based on social trust rather than laws and contracts. Such networks constitute a complex system that have been relatively unstudied yet have a significant impact on people's lives. Examples range from local baby-sitting circles up to the Hawala/Hundi systems of informal value transfer shifting 100s of millions of dollars accross the globe without centralised records. Such systems of exchange often involve many social processes and mechanisms other than those usually considered, including: social norms, altruism, reputation, trust, group membership, friendship, kinship, identity, status etc. This workshop is on studies and simulation to further their understanding. Guest speaker: Roger Ballard the Director (Centre for Applied South Asian Studies) will talk on the Informal Hawala/Hundi Systems of Value Transfer More details at: http://cfpm.org/scive. Bruce Edmonds (UK), David Hales (Netherlands), Mario Paolucci (Italy), and Juliet Rouchier (France)