The document discusses different models of collaboration between professional conference organizers (PCOs) and their association clients. It emphasizes the importance of understanding client needs and goals, aligning expectations, and selecting the right model for each partnership. Fixed fees, variable fees, guaranteed returns, and profit/risk sharing models are described along with their potential strengths and weaknesses from the perspectives of both the client association and the PCO/AMC. Effective collaboration requires open communication and ensuring the interests of all stakeholders are addressed.