The University of Wisconsin Solar Energy Laboratory (UWSEL) has been supported by the US Department of Energy through the Golden Field office. The contract was moved to National Renewable Energy Laboratory (NREL) for the period of May 26, 1999 through May 25, 2000. The majority of the projects were to be completed after the end of the DoE contract period (December 1999) since continued DoE funding was anticipated. Although the DoE funding has continued, it is now monitored through NREL. This report summarizes work to date. Two MS theses will be submitted to NREL in December 1999 as part of the current contract. Copies will also be sent to DoE.. The SEL has addressed a number of issues with the developments to TRNSYS in anticipation of release of version 15. The two major developments have been a complete overhaul of the IISiBat graphical user interface and the addition. The Center for the Scientific Study of Buildings (CSTB) in Sophia Antipolis France has completely rewritten IISiBat as a native Windows program, replacing the current version written in LISP. LISP, while it allows programs to run on both Windows and Unix platforms cannot make use of many of the standard Windows programming tools. Consequently the current IISiBat version (2.0) feels rather clumsy to use. Other additions to IISiBat include the ability to create multi-layered system diagrams, and the ability to automatically generate html based documentation for new Types that the user has developed and wishes to add to the standard TRNSYS library.