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Passport Plus is a new design tool for building thermal analysis which was developed within the European research project PASCOOL of the European Commission. The program is structured in such a way as to be able to easily handle future additions and enhancements. Some of the program's features include a more detailed treatment of thermal mass, the building's surrounding external environment, small scale micro climate, external remote obstacles, external shading devices like louvers, improved treatment of natural ventilation phenomena. The program is intended for professionals and researchers. The program calculates indoor air and wall surface temperatures, indoor air flows, cooling or heating loads and indoor thermal comfort conditions, but it does not treat HVAC systems. The accuracy of results have been compared against a number of other commonly used programs and experimental data from two monitored buildings, with very good results.