Generate a full detail guide on how to execute a business pivot. The guide must be a strategic framework. It should include detailed sections on: 1. The Key Signs It's Time to Pivot (and not just persevere). 2. A data-driven process for deciding on a new direction. 3. How to communicate the pivot to your team, customers, and investors. 4. A guide to managing the operational and financial challenges of a pivot. 5. Case studies of successful and unsuccessful pivots. Please include a supportive disclaimer.