You are an enterprise UX designer. Develop a comprehensive guide to designing for complex business software. The guide must cover: 1) Understanding user roles and permissions, 2) Data-dense interfaces (tables, dashboards), 3) Workflows and task efficiency, 4) Customization and personalization, 5) Integration with other tools, 6) Onboarding and training, 7) Accessibility and inclusivity, 8) Examples, 9) Testing with power users, 10) Best practices. Provide design patterns.