Data needed for the project research are collected from the state institutions, primarily:
• Information system for energy management (ISGE),
• National Energy Efficiency Authority, from their System for measuring and verifying energy savings (SMIV),
• Environmental Protection and Energy Efficiency Fund (other relevant data on measures and supports from)
The data from ISGE system include characteristics of Croatian public buildings from the energy certificate supplement reports, and also dynamic data on real energy consumption. The data from SMIV system include planned and implemented measures for increasing efficiency in public buildings, estimated savings, estimated reduction of CO2 emission, and estimated costs of implemented measures. In addition, other potentially relevant variables are used: metorological data, season as a fuzzy variable, and others.