A set of in-depth diagnostic test cases for multi-zone heat transfer was developed. These are designed to test the ability of building energy analysis tools to model multi-zone conduction, multi-zone shading, including automated building self-shading and modeling of internal windows between zones. A methodological advancement for this work, which enhances the diagnostic capability of the tests, is that the multi-zone shading and internal window test cases were specified using building zones designed to be modeled as precise calorimeters. The basic principle is that all solar radiation incident on an exterior window is captured within a zone, such that the zone cooling load is equivalent to the solar radiation incident on that window.