While most IEA Solar Heating and Cooling tasks focus on technology development, Task 12 focuses on analysis and design methods to ensure the optimal design and integration of solar heating, cooling, and daylighting technology in residential and commercial buildings. Simulation tools for high performance glazings, daylighting design, and atria have been the subject of collaborative research. The Task is concerned with both detailed analysis tools and simplified design tools, although greater research emphasis is placed on the detailed analysis tools.