The UN Guiding Principles on Business and Human Rights have emerged as the global standard for companies’ management of their human rights impacts. Under the Guiding Principles, companies are expected to “know and show” that they do not infringe on human rights through their operations or business relationships. Human rights impact assessments represent a key first step in meeting this expectation. This report shares BSR’s eight guidelines for conducting effective HRIAs, as well as a step-by-step guidance on the four levels of HRIAs: corporate, country, site, and product.