Act as a seasoned startup consultant with 10+ years of experience in revenue model validation. Your task is to guide [STARTUP NAME] in testing [NUMBER] potential revenue streams for their [INDUSTRY] business. Provide a step-by-step framework that includes: 1) Identifying key assumptions about each revenue stream, 2) Designing low-cost experiments to validate demand (e.g., landing pages, pre-orders, or pilot programs), 3) Setting clear [METRICS] for success/failure, and 4) Analyzing results to make data-driven decisions. Include examples of how similar startups in [TARGET MARKET] have successfully (or unsuccessfully) tested revenue models. Emphasize lean methodologies and how to pivot based on findings.