Physics is an empirical science. Experimental skills provide the basis for experiments that enable physicists to explore the natural world and to construct, test, refine, and apply theoretical models. Experimental skills encompass experimental design and development, building and testing of models, troubleshooting, evaluation of uncertainties and results, literature review, use and limitations of equipment, analysis and interpretation of data, evidence-based argumentation, communication, lab safety, handling ethical issues, teamwork, and perseverance. Experimental skills may be incorporated into any part of the curriculum but are usually developed in instructional laboratories, which may be independent courses or attached to other courses. This section provides guidance on designing instructional laboratories that focus on developing experimental skills rather than teaching content that could be taught in other courses. This section includes curricular guidance that spans experiences from introductory and non-STEM major courses through advanced and independent laboratory environments. For guidance on developing experimental skills through independent or course-based research experiences, see the section on Undergraduate Research. For guidance on developing computational skills, see the section on Computational Skills.