Summary : Articles: (1.) Participatory research with user groups: key issues and challenges. Anke Niehof, Gelia T. Castillo, and Keith O. Fuglie; (2.) Community-based production of healthy sweetpotato planting materials in Central Luzon, Philippines. Lilibeth B Laranang and Carlos S. Basilio; (3.) Enhancing production and on-farm maintenance of quality potato seed in Nepal. Tara Lal Lama and Oscar Hidalgo; (4.) Learning for research and researching for learning: farmer participation in potato IPM research in Vietnam. Elske van de Fliert and Quach Thi Que; (5.) Pilot evaluation of potato integrated disease management in the mountain agroecosystems of Hubei, China. Xie Conghua, Dindo M. Campilan, Wu Chengjin, Nie Bihua; (6.) Promoting integrated disease management (IDM) through farmer field schools in Nepal. Tara Lal Lama, Shyam Prasad Dhakal and Dindo M. Campilan; (7.) Participatory on-farm experiments for integrated crop management with sweetpotato farmers in Bataan, Philippines. Justo D.G. Canare, Jr., Jonathan L. Galindez, and Nonata H. Manalastas; (8.) Influence of traders, processors and consumers on sweetpotato production in Central Luzon, Philippines. Irene M. Adion, Clarita J. Aguilar and Fe L. Porciuncula; (9.) Assessing the potato marketing systems in North Sumatra, Indonesia. Witono Adiyoga, Keith O. Fuglie, and Rachman Suherman; (10.) Rural income generation by improving the crop-based pig system: from diagnostics to interventions and dissemination. Dai Peters, Mai Thach Hoanh, Nguyen The Yen Thi Tinh, and Pham Ngoc Thach; (11.) Producer-consumer chain in the potato chips industry of Indonesia. Rofik Sinung-Basuki, Kusmana and Ahmad Dimyati; (12.) Starch markets in Asia: opportunities and constraints. Keith O. Fuglie and Christopher G. Oates; (13.) Participatory approach in improving agroenterpises in Duong Lieu Commune, Vietnam. Dai Peters; (14.) NGO experiences in developing integrated crop management FFS: a case study of VECO/FADO partners in Eastern Indonesia. (15.) Engaging local government units as partners in research and development: the case of sweetpotato integrated crop management in the Philippines; (16.) Challenges and issues in data management: assessing the contribution of sweetpotato to household nutritional and livelihood improvement in Northern Philippines; (17.) Monitoring and evaluating a pilot training course on participatory research and development; (18.) Evaluating organizational capacity in participatory research: the case of a Rootcrops Center in the Philippines; (19.) Sampaguita livelihoods of peri-urban Metro Manila, Philippines: key actors, activities, benefits and constraints; (20.) Participatory diffusion of rice technologies: the Iloilo-IRRI DAPITSAKA Project; (21.) Bringing forages beyond feed resource boundaries: evaluating forages for soil conservation in the uplands of Bukidnon, Philippines; (22.) Participatory approaches in improving small-scale crop-livestock systems in Southeast Asia; (23.) Participatory methodologies for sustainable coconut-based agricultural system in the Philippines.