Generate a comprehensive framework for assumption mapping, designed to systematically identify and validate core business assumptions.  The framework should guide users through a structured process, starting with brainstorming all underlying assumptions related to their business model (e.g., market size, customer acquisition cost, product-market fit, pricing strategy, team capabilities).  For each assumption, the framework must prompt for: 1) The assumption statement itself; 2) The impact of the assumption being incorrect; 3) Evidence supporting or contradicting the assumption (include prompts for data sources and methods of validation); 4) A plan for testing and validating the assumption using a series of micro-experiments or data collection methods; 5) Metrics for measuring the success or failure of each validation effort; and 6) A contingency plan if the assumption is proven false. The output should be a structured template suitable for spreadsheet software (e.g., Google Sheets or Excel), allowing for easy organization and tracking of assumptions, validation plans, and results.  Include example prompts for each section to illustrate the process. The framework should explicitly consider biases in assumption making and encourage critical self-reflection.  Finally, the framework should facilitate the prioritization of assumptions based on their criticality and impact on the overall business model.