A Method for Predicting Daylight from Windows by H. H. Higbie and W. C. Randall provides an in-depth theoretical approach to determining the degree of illumination generated by various window arrangements in buildings. The text addresses the need for a scientific approach to natural lighting in modern building design, where light is crucial. The method focuses on diffused light and offers mathematical formulas to calculate illumination at any point on a working plane, considering factors like window orientation and sky brightness. These formulas are validated against real-world data from full-sized buildings and scaled models to ensure accuracy, making the method highly practical. This bulletin also includes graphical methods and applications to various types of industrial and commercial buildings, emphasizing the practical utility of predicting natural light distribution for optimizing building designs and ensuring sufficient illumination in workspaces. With thorough analyses and checks, the authors ensure that their method provides reliable predictions, bridging theoretical research and practical applications in architectural engineering.