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These techniques include traditional economic valuation methods, such as preference-based surveys, as well as valuations based on the relationship between a given experience and its effect on an individual's subjective wellbeing.
National guidelines in Canada and the United States have recommended using community-preference-based valuation methods, such as the HUI systems, for economic evaluations and HRQL assessments [ 18, 19].
Compared to other contingent valuation methods such as discrete choice experiment and payment card method, the OE questionnaire method is generally reported to yield lower (conservative) WTP values [ 31, 43, 44] and may have a better construct validity.
Health state valuation methods such as TTO may be used to value the health states of a health state classification system, such as the EQ-5D, the SF-6D or disease-specific questionnaires.
Some valuation methods, such as chained TTO and chained SG, also use the most severe health state as the 'temporary health state' and ask participants to trade-off or gamble the other health states between the perfect health and the most severe health state [ 5].
This interval-type utility index indicates the value of various specific health states using standardized valuation methods such as time trade-off or standard gamble, and is essential in health economic evaluation like cost-utility and quality-adjusted life-year analyses.
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This paper presents a methodology to estimate the environmental costs of products during the concept design phase by integrating a Simplified Life Cycle Assessment SLCCA) methodology with Economic Valuation (EV) methods such as EPS2000d, EXMOD and Ecosense.
This study demonstrates that it is possible to facilitate economic evaluations for specific health conditions when a preference-based measure has not been administered and when it would be impractical to conduct a valuation survey using methods such as SG or TTO.
This has led to a number of government-sponsored studies which have used methods such as Contingent Valuation to estimate the benefits of, for example, a number of Environmentally Sensitive Areas (ESAs).
The EQ-5D-5L value sets are best to be estimated through direct valuation of the health states using methods such as time trade-off.
Therefore, if the perceived value is expected to vary among the individual sustainability aspects, we suggest an additional step in which the value of the impact is included through a weighting procedure, for example, a ranking or more advanced methods such as monetary valuations.
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