1. FAO, the Food and Agriculture Organization: Assigned to the Farming Systems Project: West Java and Lampung Provinces Indonesia: 1979-1980
    1. Report on the Pilot Farm Survey 1980 in Cikajang, Garut District & Jalaksana, Kuningan District: West Java Province. Bandung 1980 
  2. The Directorate General for Technical Co-operation of the Ministry of Foreign Affairs of the Netherlands: -The Malang Research Institute for Food Crops.1981-1989.
    2. Tentative Work Program 1981-1986 Agro-Economic Section. December 1981
    3. Existing Cropping Systems in Madura, October 1983
    4.National Panel of Farmers: East Java Pilot Project 1982-1983: November 1983 Co author
    5. Joint Proposal for an “On-Farm Research” Program for Maize: January 1984 Co author
    6. A Maize On- Farm Research Program. March 1984 Co author
    7. The MARIF Maize On-Farm Research Program 1984: October 1984: Co Author
    8.WORKING PAPER SERIES Malang Research Institute for Food Crops: 1984- 1988 Co Author
    - No 3 Trial Results On Farm Trials 1984 – First Dry Season Co Author
    - No 4. Report on a Study Tour to Thailand August 22-30, 1984 Co Author
    - No 5 Synopsis of the MARIF On-Farm Research Program for maize based farming systems January 1985. Co Author
    - No 6.  Introduction to the MARIF OFR Program, March 1985: Co Author
    - No 7 Report on Trial results: Rainy season 1984/1985, May 1985: Co Author
    - No 8. Report on the Maize Survey in Malang District December 1984, May 1985: Co Author
    - No 9. Report on Trial results Cycle No 3 Post rainy season 1985.June 1986 Co Author
    - No 13. Notes on Costs and Returns of On-Farm Research January 1986
    - No 14 A Study Tour to Thailand August 5-14, 1985, September 1985 Co Author
    - No 15 Report on the Trial Results Cycle No 4 Rainy season1985/1986 Co Author
    - No 19 Report on the Trial results Cycle 5,6 & 7- 1986-1987 October 1987 Co Author
    - No 20 Report on the Trial Results Cycle 8 &9 2987-1988. September 1988 Co Author
    9.The On-Farm Research Program for Palawija based farming systems in Malang District East Java, Indonesia 1984-1986. Kansas USA October 1986 Co Author
    10.The On-Farm Research Program in the District of Malang, April 1988 On the occasion of the visit of Drs P. Bukman Minister of Development Cooperation of the Netherlands: April 24, 1988: Co author
    11.Program for the visit of the Prime Minister of the Netherlands, Minister Lubbers on 2 November 1988 to the MARIF. Gave a presentation of the MARIF On Farm program.
    12. On Farm Research Workshop Malang April 1988 Co Author
    13.  Five Years On farm research in MARIF 1984-1988, April 1989 Co Author
    14. Technical Report On Farm research in South Malang  & Kabupaten Mojokerto September 1989 Co Author
    15. Terminal Assignment Report Charles van Santen April 1989
    16. Maize On-Farm Research in the District of Malang, Monograph 1987 Co Author
    17. Program for the visit of the Prime Minister of the Netherlands to MARIF, November 1988
    18. Planned Change in Farming Systems: edited by Robert Trip. John Wiley & Sons, Chicester 1991: Chapter 7 From Diagnosis to Farmer Adoption: MARIF’s On-Farm Maize Research Program in East Java. Co Author -Strengthening the Lembang Horticulture Institute: Evaluation Mission. 1989
    19. Report of the Mid Term Evaluation Mission of Project ATA395 Lembang Horticultural Research Institute October 1989 Co Author
  3. The Economic and Social Commission for Asia and the Pacific of the United Nations: Assigned to The Regional Co-ordination Center for Research and Development of Coarse Grains, Pulses, Roots-and Tuber crops in the Humid Tropics of Asia and the Pacific in Bogor, as the Program Leader for Human Development Resources covering all 15 Asian and Pacific member countries of ESCAP: 1989-1995
    20. Regional Training Course On-Farm Research Malang May 1991 Reader: Editor C van Santen
    21. Rural Employment and Small-scale Rural Food Processing in Asia: Workshop Los Banos The Philippines November 1990. Co editor
    22. Women in Upland Agriculture in Asia Workshop: Chiang Mai, Thailand. February 1995. Co editor.
    23. The Farm Survey, March 1995
    24. Introduction booklets to Regional Training Courses organized by me:
    -Increasing soybean production in Asia Thailand August 1990
    -CGPRT crops based small scale processing industries, Philippines, November 1990
    -On Farm Research, Malang Indonesia May 1991
    -Comparative Advantages of coarse grains, pulse and root crops, Bogor November 1991
    -Priorities for soybean development in Asia Bogor, December 1991
    -Regional statistical database system for coarse grains, pulses and root crops. Bogor May 1992
    -Changes in food production: Effect on production and use of upland crops in Asia Sri Lanka October 1992
    -On Farm Adaptive Research Viet Nam February 1993
    -Upland agriculture in Asia Bogor, April 1993
    -Marketing & processing of food legumes and coarse grains, Malaysia May 1993
    -Study tour to Indonesia for staff Department of Agriculture of Sri Lanka, Java July 1993
    -Planning meeting for study: Women’s role in upland farming. Sri Lanka October 1994
    -Women’s role in upland farming development. Thailand February 1995 
  4. The Commission of the European Communities Technical Assistance to Developing Countries in Asia and Latin America: 1995-1996 & 1998:
    A. Palawija Seed Production & Marketing Project: 1995-1996
    25.The Source of Farmers’ Soybean Seed in Indonesia. October 1995. Co Author
    26. Local Soybean Seed Systems in Indonesia April 1996 Co –author
    27.Integrating Seed Systems for Annual Food Crops, Workshop Proceedings 1996: Co editor    B. Evaluation Study North Bali Ground Water Irrigation and Water Supply Project: 1998
    28.Project Extension Review Mission, October 1998. Co Author
  5. World Bank financed Projects, located in the Ministries of Public Works, Settlement & Regional Infra Structure and Agriculture of the Republic of Indonesia:
    -Java Irrigation Improvement & Watershed Resources Management: 1996 and 1999
    29. Economic Viability Assessment Model Java Irrigation and Water Resources Management Project. July 1996. Co Author. Update July 1999-Sulawesi rain-fed Agricultural Development Project 1997 SAADP
    30. Farming Systems Research for Agricultural Area Development February 1998

    - Feasibility Study of the Pulisan Ecotourism Project: Minahasa Permai Resort Development 1997

    31. Pulisan Agro- Forestry Estate Prefeasibility Study: July 1997 - Nusatenggara Agricultural Development Project: Naibonat Kupang, NTT: 1997
    32. Adaptive Research Some Basic Issues: July 1997
    31. Research Management: September 1997-Ground Water Development Project: 1998-1999
    34.Report on the condition and economic impact of the taxi pump pilot program Febr. 1999
    35. Farmer Initiatives in Pump Development: The case of the Groundwater development Project
    36. A Preliminary Assessment of the Impact of Groundwater on Agricultural Production: 1999
    37. Report on the Economic Analysis of GWDP’s Performance: November 1999
    38. End of Assignment Report Agricultural Economist Groundwater Development Project December 1999 -The Irrigated Swamp Development Project 2000
    39.Economic Analysis of ISDP’S Performance Sept 2000-Water Resources and Irrigation Sector Management Program: 2003
    40. Economic Analysis Report May 2003: Co-author