Design a comprehensive decision-making model specifically for environments characterized by volatility, uncertainty, complexity, and ambiguity (VUCA). Your model should include: 1) A process for identifying the nature and sources of uncertainty in a given situation, 2) Methods for quantifying and comparing different types of risks, 3) Approaches for making decisions when complete information is unavailable, 4) Strategies for revisiting and adjusting decisions as new information emerges, 5) Techniques for communicating complex decision rationales to diverse stakeholders. Provide concrete examples of how this model would be applied in specific high-stakes business scenarios.