Think Before You Invest is a practical business validation framework designed to help investors evaluate an opportunity before committing capital. It contains 24 checks across six areas: Capital & Cost, Model Fit, The 90-Day Plan, Legal & Administrative Setup, Systematization Foundation, and Personal Capacity. The framework examines hidden costs, realistic returns, workload, operational planning, legal protection, business systems, hiring needs, and personal capacity. Investors are encouraged to create a clear 90-day plan, define success metrics, separate personal and business finances, and prepare for year-one challenges. The framework concludes by counting red flags and using a five-year perspective before investing.