The market for building-integrated photovoltaics (BIPV) is evolving, necessitating the development of a comprehensive interdisciplinary evaluation methodology. IEA-PVPS Task 15 developed a cross-sectional evaluation tool, designed for architects, developers, and other stakeholders involved in BIPV projects. Through a step-by-step process, this methodology addresses economic, energy-relevant, environmental, and visual performance, providing a robust tool for comparing and optimizing BIPV installations.