The ECA computer program has been developed as a decision support tool for educational buildings. It was prepared under IEA ECBCS programme Annex 36 - 'Retrofitting of Educational Buildings' under the leadership of the Operating Agent Hans Erhorn from the Fraunhofer Institute of Building Physics (IBP), Stuttgart.

Participants were:
Cenergia Energy Consultants
DBUR Danish Building and Urban Research
Finnland VTT Building and Transport
Germany Fraunhofer Institute of Building Physics (IBP)
University of Stuttgart IKE
Bremen University of Applied Sciences Dept. of Architecture
Greece National Technical University of Athens
Norway Norwegian Building Research Institute
Poland Poznan University of Technology Institute of Environmental Engineering
GB Schools Building & Design Unit Dept. for Education & Employment
USA U.S. Department of Energy
The work was funded by the national energy programmes. None of the participation organisations, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, expressed or implied, or assume any legal liability or responsibility for the accuracy, completeness or usefulness of any results or of any information disclosed, or represents that its use would not infringe privately owned rights. The program was prepared with the assistance and participation of representatives from many organizations based on consensus and available information.
This is the first and international version of the ECA. The national experts of the participating countries surveyed the careful development. Still the software could contain bugs. Users should carefully review the results to make sure that they are credible and consistent. If bugs or inconsistencies should occur, please inform your national representative (see information within the ECA).
The ECA is copyrighted under the property of the Operating Agent for the benefit of the participants. It may be reproduced and distributed in the participating countries of the Annex 36 project.