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Since the PA 21 defines the action and intervention strategies at the level of ecosystems/critical resources, selection
of SDIs should be aligned along this manner to aid in future monitoring of compliance with PA 21.
Due to the intertemporal aspects of the sustainable development issue, the SDIs must be calculated using time series
data (in this respect, 10-year data points).
E.O. 406 mandates the institutionalization of the PEENA System which will generate macro-indicators that shall reflect
the relationships and interactions between the natural environment and the economy and to support other data
needs of SD planning.
The indicators are meant primarily for monitoring progress in the implementation of PA 21 and other SD-related programs.
The indicators are classified into pressure, state or response indicators to distinguish among them which are cause,
effect or social response factors. This information will be considered in the analysis of the trends shown by the
indicators.
Indicators will be considered as "good" if they show significant changes as a likely result of the implementation of SD interventions.
It is envisioned that policy makers will make use of these indicators to aid them in planning, programming and
decision-making processes. As such, ordinary people should also grasp the idea on why these policies are passed.
The indicators should lend themselves to assessment of the global progress in pursuit of SD.