The 3x3 Framework provides a structured nine-step process for integrating green infrastructure assets into asset management plans. It is divided into three phases: 'Know Your Assets', 'Plan the Lifecycle', and 'Secure the Future', each containing specific steps aimed at understanding asset performance, planning for sustainability, and ensuring financial justification for asset decisions. The framework emphasizes the importance of assessing current assets, forecasting future demands, and continuously improving asset management practices.