Installing the ERM for PSS Managed Package, enabling Person Accounts, and enabling Web-to-Case are three prerequisite items that should be configured so that PSS components can be used to respond to an emergency. The ERM for PSS Managed Package is a package that contains the Emergency Response Management (ERM) app, which is a prebuilt app that comes with Public Sector Solutions. It can help public sector agencies to create and manage emergency response programs and services, and enable citizens to access resources and submit requests. Enabling Person Accounts is a feature that can be used to store information about individual people who are not associated with a business account, such as citizens or volunteers. Enabling Web-to-Case is a feature that can be used to create cases from web forms submitted by external users, such as emergency service requests. Reference: https://help.salesforce.com/s/articleView?id= psc_admin_setup_community_response.htm&type=5&language=en_US