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Daylight 1-2-3 is a non-expert design analysis tool that supports daylighting-related design decisions in commercial buildings during the initial design and design development stages. The tool predicts the daylighting and energy performance of sidelit and/or toplit private offices, open plan offices, and classrooms. The tool’s main objective is to help design professionals with interest in - but no expert knowledge of - daylighting to develop climate-responsive daylighting design concepts; to optimize façade/ roof layout and orientation with respect to daylight and energy use; and to quantify energy savings from occupancy sensors and/or photocell controlled dimming.