This course is based upon a broad building science curriculum and presents a solid scientific foundation upon which inspectors and auditors can build an accurate understanding of modern buildings. Each topic includes an overview of the technology, examples of typical installations and their defects, procedures for performing audits, and guidelines for analyzing potential retrofits. A balanced approach to building performance is presented here that addresses energy efficiency, building durability, and human health. The information presented here covers the topic areas included in the Weatherization Assistance Program Core Competencies. This course provides core competencies for technicans who will also complete classroom training.