Subsequently the methodology was extended by Techne Consulting, as a part of the implementation of systems for managing the energy balance and more generally for evaluating energy and environmental data.

In particular, the model allows to:

• Assign uncertainty of basic data
• Assign uncertainty of emission factors
• Calculate the uncertainty of emissions as a combination of basic data and emission factors uncertainties
• Calculate the uncertainty of the energy balance items as a combination of uncertainties of the different variables that compose them

DARS method for data uncertainty determination, provides for the allocation of four different scores according to the following criteria:

• Measurement/method
• Source specificity
• Spatial congruity
• Temporal congruity

This structure is applied to basic data (and therefore to the energy data and to the data functional to the estimation of pollutants' emissions) and to the emission factors.