The document discusses frameworks for donor acquisition and investment in channels. It analyzes different channels based on metrics like cost per acquisition, lifetime donor value, and internal rate of return. Online channels perform best across all metrics but further understanding is needed of how channels interact, as activity in one channel like TV may drive sign-ups in another like online. The key approaches outlined are investing strategically, optimizing the channel mix based on financial value, maintaining multiple channels, and exceeding the minimum donor replacement rate to ensure growth. Currently spending is below the minimum replacement rate required to stay flat, so investment would need to increase if return on investment remains the same.