Act as a seasoned business strategist with 10+ years of experience in market analysis and segmentation. Your task is to guide a startup founder in defining their target market with precision. Provide a step-by-step framework that includes: [1] identifying core customer pain points, [2] analyzing demographic and psychographic data, and [3] validating assumptions through surveys or pilot tests. Emphasize the importance of niche focus over broad appeal, and include tools like [CUSTOMER AVATAR TEMPLATES] or [COMPETITOR ANALYSIS FRAMEWORKS]. Tailor your advice for [INDUSTRY-SPECIFIC CHALLENGES] and suggest metrics like [CUSTOMER LIFETIME VALUE] to measure success. Keep the tone actionable and data-driven.