Delphi method

The Delphi method is a systematic and interactive forecasting method relying on a panel of experts. In policy relevant situations Delphi is usually used to develop consensual ideas on potential policy pathways by paying attention to the integration of outlier opinions. The Delphi method consists of two or more rounds of questioning, either via personal (online or offline) questionnaires or group discussions. After each round the researchers or facilitators provide a summary of the results (incl. answers and comments provided). Questions for the next round are developed on this basis, allowing experts to reconsider their opinion in each round.

Discrete Choice Experiments (DCE)

are a stated preference valuation technique based on hypothetical choices individuals make in carefully prepared situations. It allows to formally model people’s preferences and estimate their willingness-to-pay for particular characteristics of goods and services (including non-market goods, such as environmental public goods).

Economic experiments

typically use (cash) incentives to study economic decision-making under controlled conditions in abstract (laboratory) or somewhat contextualised (field) settings.

Economic incentives

In environmental economics it is considered that policy-makers have two broad types of instruments available for changing consumption and production habits in society: 
1) Traditional regulatory approaches (sometimes referred to as command-and-control approaches) that set specific standards across polluters.
2) Economic incentives or market-based policies that rely on market forces to correct for producer and consumer behavior (such as pollution/ emissions taxes, subsidies, Payments for Environmental Services (PES), agri-environment-climate measures (AECM).

Ecosystem services (ES)

are the direct and indirect contributions of nature to human well-being (TEEB 2010; CICES classification). Ecosystem services include the terms ecosystem goods and services (Albert et al., 2016), and environmental services. In many cases, the use of ES requires human input (UK NEA, 2011). Such human input includes, e.g., fertiliser, technology or knowledge.

See also: Nature Contributions to People (NCPs)

References

Albert, C., A. Bonn, B. Burkhard, (..) and H. Wustemann, 2016. Towards a national set of ecosystem service indicators: Insights from Germany. Ecological Indicators 61 (1) 38-48. DOI: 10.1016/j.ecolind.2015.08.050
TEEB, 2010. The Economics of Ecosystems and Biodiversity Ecological and Economic Foundations. Edited by Pushpam Kumar. Earthscan: London and Washington.
UK National Ecosystem Assessment, 2011. The UK National Ecosystem Assessment: Synthesis of the Key Findings. UNEP-WCMC, Cambridge.