Usability testing is a critical component of software development, providing essential insights into user experience (UX) by observing how users interact with digital products to identify pain points and areas for improvement. Various methods are available, including moderated testing, which involves direct interaction with participants, and unmoderated testing, which allows users to complete tasks independently, offering scalability and cost-effectiveness. Think-aloud testing asks participants to verbalize their thoughts, while remote testing enables users to engage from their own locations, albeit with potential technical limitations. A/B testing compares different versions of a product to determine optimal usability, and benchmark testing assesses product performance against industry standards. Accessibility testing ensures products are inclusive for users with disabilities. Feature flags and experimentation platforms can enhance usability testing by allowing controlled feature rollouts and real-time user feedback, enabling iterative improvements. Split's feature management platform exemplifies this approach, offering tools to safely deploy features, conduct A/B tests, and connect feature usage to contextual data for informed decision-making in software development.