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    How to Use The DELTA Model®

    There are brief descriptions to help the user within the model interface. In addition, you can learn to use DELTA by watching the short video introductions below or reading the How-to document.

    The main settings of the model are found by selecting Explore the Future from the website menu. The side-panel on the left contains the user adjustable settings.

    You can also look through our Frequently Asked Questions document for answers to specific queries. 

    Our article on The need for deep understanding of food system data also explains some key information regarding the data used in the model.

    Finally, the release notes for current and previous model versions can be found here:

    Try the DELTA Model® in your own time by taking a demo below, it takes about 17 mins and you can view the transcripts in your own language by changing the webpage language at the top right of the webpage.

    Once you are ready to go and would like to have your own login and username for your FREE access to the Model, please send us an email
    GET DELTA
    Professor Warren McNabb
    Warren McNabb is a Professor of Nutritional Science at the Riddet Institute; one of New Zealand’s Centres of Research Excellence (CoRE), hosted by Massey University. He leads SNi® and his research interests include digestive physiology and metabolism, nutrition for health, and sustainable nutrition.
    Project Leader | W.McNabb@massey.ac.nz
    Professor Warren McNabb
    Warren McNabb is a Professor of Nutritional Science at the Riddet Institute; one of New Zealand’s Centres of Research Excellence (CoRE), hosted by Massey University. He leads SNi® and his research interests include digestive physiology and metabolism, nutrition for health, and sustainable nutrition.
    Project Leader | W.McNabb@massey.ac.nz
    Dr Nick Smith
    Nick works as a mathematical modeller on the Riddet Institute SNi®. He is responsible for a wide range of SNi's work and the continued development of the SNi models like the DELTA Model®. This is a tool for investigating how global food production meets global nutritional requirements as part of a sustainable food system.
    Research Officer | N.W.Smith@massey.ac.nz
    Dr Nick Smith
    Nick works as a mathematical modeller on the Riddet Institute SNi®. He is responsible for a wide range of SNi's work and the continued development of the SNi models like the DELTA Model®. This is a tool for investigating how global food production meets global nutritional requirements as part of a sustainable food system.
    Research Officer | N.W.Smith@massey.ac.nz
    Dr Andrew Fletcher
    Andrew is a Chemical Engineer with a PhD in process control and modelling. Andrew is a Honorary Fellow at the Riddet Institute and has been involved with SNi® since the outset. He is based at the Fonterra Research and Development Centre in Palmerston North and is involved in a range of research, management and strategy roles.
    Honorary Fellow | Andrew.Fletcher@fonterra.com
    Dr Andrew Fletcher
    Andrew is a Chemical Engineer with a PhD in process control and modelling. Andrew is a Honorary Fellow at the Riddet Institute and has been involved with SNi® since the outset. He is based at the Fonterra Research and Development Centre in Palmerston North and is involved in a range of research, management and strategy roles.
    Honorary Fellow | Andrew.Fletcher@fonterra.com
    Professor Jeremy Hill
    Professor Jeremy Hill has played a major role in developing SNi®. He has also been involved in developing strategic partnerships between Fonterra and the Riddet Institute. For example, the establishment of three Professorial Chairs in Food Material Science, Nutrition, and Consumer and Sensory Science. Jeremy is the Chief Science and Technology Officer at Fonterra.
    Adjunct Professor | Jeremy.Hill@fonterra.com
    Professor Jeremy Hill
    Professor Jeremy Hill has played a major role in developing SNi®. He has also been involved in developing strategic partnerships between Fonterra and the Riddet Institute. For example, the establishment of three Professorial Chairs in Food Material Science, Nutrition, and Consumer and Sensory Science. Jeremy is the Chief Science and Technology Officer at Fonterra.
    Adjunct Professor | Jeremy.Hill@fonterra.com
    Dr Mahya Tavan
    Mahya is a postdoctoral research fellow working on the development of the iOTA model. iOTA is a dietary optimisation tool for designing sustainable diets that are nutritious, acceptable and affordable. Prior to joining SNi®, Mahya held a research role at the University of Melbourne, Australia where she carried out various research projects on sustainable food production, resource use efficiency and biofortification of fresh food.
    Postdoctoral Research Fellow | M.Tavan@massey.ac.nz
    Dr Mahya Tavan
    Mahya is a postdoctoral research fellow working on the development of the iOTA model. iOTA is a dietary optimisation tool for designing sustainable diets that are nutritious, acceptable and affordable. Prior to joining SNi®, Mahya held a research role at the University of Melbourne, Australia where she carried out various research projects on sustainable food production, resource use efficiency and biofortification of fresh food.
    Postdoctoral Research Fellow | M.Tavan@massey.ac.nz
    Raquel Lozano
    Raquel is a postdoctoral research fellow creating models for national food systems. Her PhD research focused on helping design horticultural packaging systems to minimise the environmental impact. Raquel was awarded the International Society of Horticultural Sciences Young Minds Award in 2023, and is keen to use mathematical modelling to provide holistic information to decision-makers in the area of sustainable nutrition.
    Postdoctoral Research Fellow | R.Lozano@massey.ac.nz
    Raquel Lozano
    Raquel is a Postdoctoral Research Fellow creating models for national food systems. Her PhD research focused on helping design horticultural packaging systems to minimise the environmental impact. Raquel was awarded the International Society of Horticultural Sciences Young Minds Award in 2023, and is keen to use mathematical modelling to provide holistic information to decision-makers in the area of sustainable nutrition.
    Postdoctoral Research Fellow | R.Lozano@massey.ac.nz
    Patricia Soh
    Prior to her current PhD, Patricia attained a Master of Science in Human Nutrition at Massey University, Albany. The current focus of her PhD is investigating nutritional concerns within vegan diets.
    PhD Student | P.Soh@massey.ac.nz
    Patricia Soh
    Prior to her current PhD, Patricia attained a Master of Science in Human Nutrition at Massey University, Albany. The current focus of her PhD is investigating nutritional concerns within vegan diets.
    PhD Student | P.Soh@massey.ac.nz
    Ejovi Abafe
    Prior to his current PhD, Ejovi obtained a Master’s and a Bachelor’s degree in Agricultural Economics from the University of South Africa (UNISA) and Delta State University, Nigeria. The current focus of his PhD at the Riddet Institute is Global land use for the delivery of nutrition.
    PhD Student | E.Abafe@massey.ac.nz
    Ejovi Abafe
    Prior to his current PhD, Ejovi obtained a Master’s and a Bachelor’s degree in Agricultural Economics from the University of South Africa (UNISA) and Delta State University, Nigeria. The current focus of his PhD at the Riddet Institute is Global land use for the delivery of nutrition.
    PhD Student | E.Abafe@massey.ac.nz
    Justine B. Coomson
    Prior to her current PhD, Justine obtained a Masters degree in Population, Family and Reproductive Health and a Bachelor's degree in Dietetics from the University of Ghana. Justine has worked as a research assistant and a clinical dietician in Ghana before coming to New Zealand. The current focus on her PhD is the impact of biofortification and supplementation to diets.
    PhD Student | J.Coomson@massey.ac.nz
    Justine B. Coomson
    Prior to her current PhD, Justine obtained a Masters degree in Population, Family and Reproductive Health and a Bachelor's degree in Dietetics from the University of Ghana. Justine has worked as a research assistant and a clinical dietician in Ghana before coming to New Zealand. The current focus on her PhD is the impact of biofortification and supplementation to diets.
    PhD Student | J.Coomson@massey.ac.nz
    Hannah Ramsay
    Hannah is the Project Manager for SNi®. She started her career in the Riddet Institute when she first came to New Zealand and has since done project and event work across various educational institutes. The opportunity to return to Project Management at the Riddet Institute was very welcome, especially given the fascinating research and mahi conducted as part of SNi®.
    Project Manager | H.Ramsay@massey.ac.nz
    Hannah Ramsay
    Hannah is the Project Manager for SNi®. She started her career in the Riddet Institute when she first came to New Zealand and has since done project and event work across various educational institutes. The opportunity to return to Project Management at the Riddet Institute was very welcome, especially given the fascinating research and mahi conducted as part of SNi®.
    Project Manager | H.Ramsay@massey.ac.nz
    Amelia Barker
    Amelia is a Communications Officer at the Riddet Institute. She has many years experience in digital media communications at various organisations. Amelia is passionate about research and enjoys promoting the fantastic mahi (work) that SNi® does.
    Communications Officer | A.Barker@massey.ac.nz
    Amelia Barker
    Amelia is a Communications Officer at the Riddet Institute. She has many years experience in digital media communications at various organisations. Amelia is passionate about research and enjoys promoting the fantastic mahi (work) that SNi® does.
    Communications Officer | A.Barker@massey.ac.nz
    Rangimarie Hunia
    Rangimarie Hunia was appointed an alternate director of Te Ohu Kaimoana at the beginning of 2015 before being appointed a full director in November 2015, and Chair in July 2019. The first wahine (woman) Chair in the history of Te Ohu Kaimoana. In 2017, she was appointed a Chair of Te Pūtea Whakatupu Trust. In 2016, she was appointed Chief Executive of Ngāti Whātua Ōrakei Whai Maia. Whai Maia is responsible for the well-being of its 5,000 tribal members and focuses on education, health, employment and environmental areas. She played an active role as a member of the Iwi Working Group that was established to facilitate understanding and iwi decision making in response to the 11-year Review of Māori Fisheries Settlement entities. Rangimarie is also a member of Global Women and was a finalist in the Westpac Women of Influence Awards 2014.
    Ngāti Whātua Chair of SNi® International Advisory Group Chief Executive of Ngāti Whātua Ōrakei Whai Maia
    Rangimarie Hunia
    Rangimarie Hunia was appointed an alternate director of Te Ohu Kaimoana at the beginning of 2015 before being appointed a full director in November 2015, and Chair in July 2019. The first wahine (woman) Chair in the history of Te Ohu Kaimoana. In 2017, she was appointed a Chair of Te Pūtea Whakatupu Trust. In 2016, she was appointed Chief Executive of Ngāti Whātua Ōrakei Whai Maia. Whai Maia is responsible for the well-being of its 5,000 tribal members and focuses on education, health, employment and environmental areas. She played an active role as a member of the Iwi Working Group that was established to facilitate understanding and iwi decision making in response to the 11-year Review of Māori Fisheries Settlement entities. Rangimarie is also a member of Global Women and was a finalist in the Westpac Women of Influence Awards 2014.
    Ngāti Whātua Chair of SNi® International Advisory Group Chief Executive of Ngāti Whātua Ōrakei Whai Maia
    Jeroen Dijman
    Over 30 years of practical and managerial experience in research, development, and policy and institutional change in the agricultural and rural sector. Developed and applied system innovation ideas and multi-stakeholder approaches in livestock agri-food system research and rural development planning and practice. Worked and consulted extensively for bilateral and multilateral donors, NGOs, CGIAR centres, the World Bank, UN agencies and the private sector in all major developing regions of the world. Currently engaged as the founding head of the Nestlé Institute of Agricultural Sciences at Nestlé Research. Previous roles include: • the director of the Enabling Innovation theme of International Livestock Research Institute; the senior officer of the FAO’s Pro-Poor Livestock Policy Initiative, credited to have influenced global thinking on policy and institutional change by the independent external evaluation of the FAO; • the senior officer in the Livestock Information, Sector Analysis and Policy Branch of the FAO, responsible for the design, establishment, coordination, and support to the Global Agenda for Sustainable Livestock, a multi-stakeholder partnership committed to sustainable livestock sector development; • the senior agricultural research officer for the Secretariat of the Independent Science and Partnership Council (ISPC) to the CGIAR, providing independent strategic advice to a global portfolio of 15 corporate research programmes of the CGIAR on agricultural research for development, climate change, agri-food system innovation, partnership, sustainable resource use, and impact assessment; • the Director (International) of the New Zealand Agricultural Greenhouse Gas Research Centre (NZAGRC); • the Senior Technical Adviser of the UN Environment, Climate and Clean Air Coalition agriculture initiative; and • the Managing Director, Animal Sciences Group, Wageningen University and Research.
    Head of Nestlé Institute of Agricultural Sciences
    Jeroen Dijman
    Over 30 years of practical and managerial experience in research, development, and policy and institutional change in the agricultural and rural sector. Developed and applied system innovation ideas and multi-stakeholder approaches in livestock agri-food system research and rural development planning and practice. Worked and consulted extensively for bilateral and multilateral donors, NGOs, CGIAR centres, the World Bank, UN agencies and the private sector in all major developing regions of the world. Currently engaged as the founding head of the Nestlé Institute of Agricultural Sciences at Nestlé Research. Previous roles include: • the director of the Enabling Innovation theme of International Livestock Research Institute; the senior officer of the FAO’s Pro-Poor Livestock Policy Initiative, credited to have influenced global thinking on policy and institutional change by the independent external evaluation of the FAO; • the senior officer in the Livestock Information, Sector Analysis and Policy Branch of the FAO, responsible for the design, establishment, coordination, and support to the Global Agenda for Sustainable Livestock, a multi-stakeholder partnership committed to sustainable livestock sector development; • the senior agricultural research officer for the Secretariat of the Independent Science and Partnership Council (ISPC) to the CGIAR, providing independent strategic advice to a global portfolio of 15 corporate research programmes of the CGIAR on agricultural research for development, climate change, agri-food system innovation, partnership, sustainable resource use, and impact assessment; • the Director (International) of the New Zealand Agricultural Greenhouse Gas Research Centre (NZAGRC); • the Senior Technical Adviser of the UN Environment, Climate and Clean Air Coalition agriculture initiative; and • the Managing Director, Animal Sciences Group, Wageningen University and Research.
    Head of Nestlé Institute of Agricultural Sciences
    Berry Marttin
    Berry Marttin was born and raised in Brazil. Over the course of his career at Rabobank, he has gained extensive experience as an international banker in both wholesale and retail banking, working in various senior executive positions in Australia, Indonesia, Hong Kong, Curacao and Brazil. Berry moved to the Netherlands in 2004 to become Chairman of the Board of Directors of Rabobank Amsterdam. In 2009, he joined the Managing Board with special focus on Rabobank’s international Wholesale and Rural banking activities and further responsibilities including Leasing (DLL), Rabo Carbon Bank and RaboResearch. His principal other activities outside Rabobank include serving as President of the EACB (European Association of Co-operative Banks) and Member of the Board of Neumann Foundation. Moreover, Berry serves as the first Chairman of the Global Steering Committee of the Food Action Alliance, where World Economic Forum together with IFAD, WBCSD, CIAT, AfDB and Rabobank and over 20 global leaders unite to deploy large scale action through game changing initiatives for food systems transformation. In 2021, he was invited to join the UN Food Systems Summit Champions network, a network encompassing leadership from a broad range of constituencies, in all parts of the world, who are championing food systems and food systems transformation.
    Member of the Managing Board Rabobank Group
    Berry Marttin
    Berry Marttin was born and raised in Brazil. Over the course of his career at Rabobank, he has gained extensive experience as an international banker in both wholesale and retail banking, working in various senior executive positions in Australia, Indonesia, Hong Kong, Curacao and Brazil. Berry moved to the Netherlands in 2004 to become Chairman of the Board of Directors of Rabobank Amsterdam. In 2009, he joined the Managing Board with special focus on Rabobank’s international Wholesale and Rural banking activities and further responsibilities including Leasing (DLL), Rabo Carbon Bank and RaboResearch. His principal other activities outside Rabobank include serving as President of the EACB (European Association of Co-operative Banks) and Member of the Board of Neumann Foundation. Moreover, Berry serves as the first Chairman of the Global Steering Committee of the Food Action Alliance, where World Economic Forum together with IFAD, WBCSD, CIAT, AfDB and Rabobank and over 20 global leaders unite to deploy large scale action through game changing initiatives for food systems transformation. In 2021, he was invited to join the UN Food Systems Summit Champions network, a network encompassing leadership from a broad range of constituencies, in all parts of the world, who are championing food systems and food systems transformation.
    Member of the Managing Board Rabobank Group
    Dr Jason Clay
    Jason Clay is the Senior Vice President for Markets and Executive Director of the Markets Institute at WWF, which was created to identify and address emerging global issues, trends, and tools impacting conservation in more timely, cost-effective, and scalable ways. His career has ranged from working on a family farm and for the US Department of Agriculture. He taught at Harvard and Yale and spent more than 35 years with human rights and environmental NGOs. In 1988, Clay founded Rainforest Marketing, set up a trading company within an NGO, helped Indigenous people and local communities access global markets, and launched Ben & Jerry’s Rainforest Crunch, plus more than 200 other products with sales of $100 million. From 1999 to 2003, he co-directed a WWF, the World Bank, UN FAO, and NACA consortium to identify the most significant environmental and social impacts of shrimp aquaculture, as well as practices to reduce them. From 2004 to 2012, he convened multistakeholder roundtables to create performance-based standards for commodities including salmon, soy, sugarcane, cotton, and beef. He developed WWF’s Market Transformation program in 2006 to work on agriculture, aquaculture, livestock, and corporate engagement. Clay continues to lead WWF-US efforts to improve private sector supply chain management and help their producers address the most significant impacts. In 2008, he created the Carbon and Commodities program to address supply chain GHG emissions. He has helped whole sectors improve their sustainability performance (e.g., the Global Salmon Initiative). He is now working with the global leather industry to support a DCF leather fund and is testing support for a 1% environmental performance payments to support the transition costs and incentives to finance what producers need to do to become legal and deforestation and conversion free. He is launching a two-year proof of concept for Codex Planetarius, a set of minimum global standards to reduce the key impacts of food and commodities traded internationally. Clay has authored 18 books and 500 articles, and has given more than 1,500 invited presentations. He studied anthropology and agriculture at Harvard, the London School of Economics, and Cornell (PhD).
    Senior Vice President, Markets at World Wildlife Fund (WWF)
    Dr Jason Clay
    Jason Clay is the Senior Vice President for Markets and Executive Director of the Markets Institute at WWF, which was created to identify and address emerging global issues, trends, and tools impacting conservation in more timely, cost-effective, and scalable ways. His career has ranged from working on a family farm and for the US Department of Agriculture. He taught at Harvard and Yale and spent more than 35 years with human rights and environmental NGOs. In 1988, Clay founded Rainforest Marketing, set up a trading company within an NGO, helped Indigenous people and local communities access global markets, and launched Ben & Jerry’s Rainforest Crunch, plus more than 200 other products with sales of $100 million. From 1999 to 2003, he co-directed a WWF, the World Bank, UN FAO, and NACA consortium to identify the most significant environmental and social impacts of shrimp aquaculture, as well as practices to reduce them. From 2004 to 2012, he convened multistakeholder roundtables to create performance-based standards for commodities including salmon, soy, sugarcane, cotton, and beef. He developed WWF’s Market Transformation program in 2006 to work on agriculture, aquaculture, livestock, and corporate engagement. Clay continues to lead WWF-US efforts to improve private sector supply chain management and help their producers address the most significant impacts. In 2008, he created the Carbon and Commodities program to address supply chain GHG emissions. He has helped whole sectors improve their sustainability performance (e.g., the Global Salmon Initiative). He is now working with the global leather industry to support a DCF leather fund and is testing support for a 1% environmental performance payments to support the transition costs and incentives to finance what producers need to do to become legal and deforestation and conversion free. He is launching a two-year proof of concept for Codex Planetarius, a set of minimum global standards to reduce the key impacts of food and commodities traded internationally. Clay has authored 18 books and 500 articles, and has given more than 1,500 invited presentations. He studied anthropology and agriculture at Harvard, the London School of Economics, and Cornell (PhD).
    Senior Vice President, Markets at World Wildlife Fund (WWF)
    Professor Manny Noakes
    Professor Manny Noakes has a PhD in nutrition as well as having trained as a dietitian in her earlier years. She is more recently a graduate of the Australian Institute of Company Directors. Manny is a former Director and Senior Principal Research Scientist, Nutrition and Health at CSIRO, Australia. She currently runs her own nutrition consultancy and is also a non-executive Director for Meat and Livestock Australia. She is considered a key opinion leader and advisor in nutrition and health, has extensive media and public speaking experience. She has over 25 years’ experience in many fields of nutrition and health, and has undertaken numerous clinical dietary intervention trials in weight management, functional foods and cardiovascular health. She has also undertaken research on diet and sustainability and redefined the environmental agenda from a food and health perspective. Manny has authored more than 200 peer-reviewed publications which have been cited more than 9000 times and has an H index of 52. She was instrumental in the development and release of five editions of the CSIRO Total Wellbeing Diet, which was launched in 2004 and has been translated into 17 languages and sold over one million copies in Australia. The Total Wellbeing Diet has been further commercialised to a successful online programme. Manny is the recipient of three CSIRO Medals, is a Distinguished Alumni of Flinders University, holds a research excellence award from the University of Adelaide and is a recipient of the Zonta Club Woman of International Achievement award.
    Nutrition Consultant
    Professor Manny Noakes
    Professor Manny Noakes has a PhD in nutrition as well as having trained as a dietitian in her earlier years. She is more recently a graduate of the Australian Institute of Company Directors. Manny is a former Director and Senior Principal Research Scientist, Nutrition and Health at CSIRO, Australia. She currently runs her own nutrition consultancy and is also a non-executive Director for Meat and Livestock Australia. She is considered a key opinion leader and advisor in nutrition and health, has extensive media and public speaking experience. She has over 25 years’ experience in many fields of nutrition and health, and has undertaken numerous clinical dietary intervention trials in weight management, functional foods and cardiovascular health. She has also undertaken research on diet and sustainability and redefined the environmental agenda from a food and health perspective. Manny has authored more than 200 peer-reviewed publications which have been cited more than 9000 times and has an H index of 52. She was instrumental in the development and release of five editions of the CSIRO Total Wellbeing Diet, which was launched in 2004 and has been translated into 17 languages and sold over one million copies in Australia. The Total Wellbeing Diet has been further commercialised to a successful online programme. Manny is the recipient of three CSIRO Medals, is a Distinguished Alumni of Flinders University, holds a research excellence award from the University of Adelaide and is a recipient of the Zonta Club Woman of International Achievement award.
    Nutrition Consultant
    Lain Jager
    Lain Jager is best known for his time with the hugely successful kiwifruit marketer Zespri. During his tenure as CEO, Zespri grew strongly through the impact and recovery from the bacterial vine disease pseudomonas syringae pv actinidiae (Psa-V), grower returns doubled, and the share price grew from $1.00 to $8.00. Today, Lain is involved in a range of investment projects in tourism and agribusiness, serves as a director on several boards, acts as a strategic advisor to a small number of companies, and is Chairman of New Zealand’s Primary Sector Council, which was established in April 2018 by the Minister of Agriculture to create a vision for the primary sector and provide independent advice to government on issues facing the sector. The Primary Sector Council’s vision for New Zealand’s agriculture, food and fibres sector is to be a world leader in modern regenerative production systems that are Fit for a Better World. Primary Sector Council Chair Lain Jager says Fit for A Better World is about providing the world’s most discerning consumers with outstanding, ethically produced food, natural fibres, drinks, co-products and bio-products.
    Chair of the Thought Leaders Group for Te Puna Whakaaronui Food and Fibre Think Tank
    Lain Jager
    Lain Jager is best known for his time with the hugely successful kiwifruit marketer Zespri. During his tenure as CEO, Zespri grew strongly through the impact and recovery from the bacterial vine disease pseudomonas syringae pv actinidiae (Psa-V), grower returns doubled, and the share price grew from $1.00 to $8.00. Today, Lain is involved in a range of investment projects in tourism and agribusiness, serves as a director on several boards, acts as a strategic advisor to a small number of companies, and is Chairman of New Zealand’s Primary Sector Council, which was established in April 2018 by the Minister of Agriculture to create a vision for the primary sector and provide independent advice to government on issues facing the sector. The Primary Sector Council’s vision for New Zealand’s agriculture, food and fibres sector is to be a world leader in modern regenerative production systems that are Fit for a Better World. Primary Sector Council Chair Lain Jager says Fit for A Better World is about providing the world’s most discerning consumers with outstanding, ethically produced food, natural fibres, drinks, co-products and bio-products.
    Chair of the Thought Leaders Group for Te Puna Whakaaronui Food and Fibre Think Tank
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