The Food and Agriculture Organisation (FAO) has identified considerations for technical cooperation that affect three types of sustainability:

•  Institutional sustainability. Can a strengthened institutional structure continue to deliver the results of technical cooperation to end users? The results may not be sustainable if, for example, the planning authority that depends on the technical cooperation loses access to top management, or is not provided with adequate resources after the technical cooperation ends. Institutional sustainability can also be linked to the concept of social sustainability, which asks how the interventions can be sustained by social structures and institutions;
• Economic and financial sustainability. Can the results of technical cooperation continue to yield an economic benefit after the technical cooperation is withdrawn? For example, the benefits from the introduction of new crops may not be sustained if the constraints to marketing the crops are not resolved. Similarly, economic, as distinct from financial, sustainability may be at risk if the end users continue to depend on heavily subsidized activities and inputs.
• Ecological sustainability. Are the benefits to be generated by the technical cooperation likely to lead to a deterioration in the physical environment, thus indirectly contributing to a fall in production, or well-being of the groups targeted and their society?

Some ecologists have emphasized a fourth type of sustainability.

• Energetic sustainability. This type of sustainability is often concerned with the production of energy and mineral resources. Some researchers have pointed to trends which document the limits of production. See Hubbert peak for example.

Wikipedia at: http://en.wikipedia.org/wiki/Sustainability#Types_of_sustainability