The 4th Asian Regional Conference & 10th International Seminar on Participatory Irrigation Management (PIM) will be held in Tehran from 2-5 May, 2007 by the Iranian National Committee on Irrigation and Drainage (IRNCID), ICID & INPIM. The World Bank and IWMI will support this conference as well. Therefore, all the interested participants and the honorable members of ICID, INPIM, IWMI and NC' S are welcome to exchange ideas, experiences, new technologies and innovations, as well as, share benefits from new research and development by deliberating a lot of aspects of PIM .