Criteria used to select indicators

· Be Similar to SIDS Portugal: The indicator should be as established in SIDS Portugal.

· Adaptability of the indicator: Indicators with different units of measurement and/or methodological approach from those established in SIDS Portugal but, nevertheless, adaptable, should be considered.

· Relevance of the indicator: The indicator should be relevant, useful and adequate for the study, in the context of the environmental sustainability assessment.

· Availability of information: The indicator should have adequate coverage over time (at least 4 years).