Usability can be measured using various methods: 1. Surveys and Questionnaires: These can gather subjective feedback from nurses about their experiences with a system. 2. Usability Testing: Observing nurses as they use a system in a controlled environment can provide valuable insights into its usability. 3. Analytics: Monitoring usage patterns and error rates can help identify areas where a system may be falling short. 4. Focus Groups: Engaging a group of nurses in discussions about their experiences can uncover common pain points and areas for improvement.