This WOPs is a peer-support arrangement between Compañía Salteña de Agua y Saneamiento S.A. (Aguas del Norte) Argentina and Companhia de Saneamento Ambiental do Distrito Federal(Caesb) Brazil, carried out on a not-for-profit basis with the objective of strengthening operator capacity.

An initial collaboration to support Aguas del Norte with energy efficiency was expanded to metering, tariffs, IT systems and wastewater treatment. Activities consisted of assessment visits, on-the-job and classroom training, and frequent remote exchanges that addressed issues ranging from technology and working methods to strategic organization and planning. The management of the WOP was informal and flexible.