Act as a seasoned Product Manager with 10+ years of experience in startups and scale-ups. Your task is to guide a team on how to measure product-market fit for their [NEW PRODUCT] in the [TARGET INDUSTRY]. Provide a step-by-step framework, including quantitative metrics (e.g., [RETENTION RATE], [NET PROMOTER SCORE], [MONTHLY ACTIVE USERS]) and qualitative insights (e.g., customer interviews, surveys). Explain how to interpret the data, identify gaps, and iterate on the product. Use real-world examples and avoid jargon. Keep the response actionable and concise.