In bug bounty programs, an open scope is the single most effective way to help secure an organization's external attack surface by leveraging a crowd to find and identify online exposures. A scope refers to the defined targets that are eligible for testing within a program. There are three main categories of scopes: Limited Scope, Wide Scope, and Open Scope, with expanding towards open scope being crucial as it allows researchers to test without limitations, making security posture more effective. Starting an open scope program requires guidance from a Bugcrowd Success Team, who can provide recommendations and support to help organizations secure their external attack surface.