To align contract milestones with agile releases, you need to adopt a collaborative and adaptive approach to contract negotiation and management. Begin by establishing a high-level vision and scope of the project, using user stories, epics, or themes to describe the desired outcomes and benefits. Define the agile release plan with the client based on their priorities, feedback, and validation. Then, set contract milestones that are aligned with the agile release plan and reflect the value delivered by each iteration or sprint. Make sure these milestones are SMART (specific, measurable, achievable, relevant, and time-bound) and agreed upon by both parties. Review and adjust the contract milestones and the agile release plan regularly. Use agile ceremonies such as sprint planning and sprint review to communicate, evaluate, and improve project performance. Additionally, use change management processes such as change requests or change logs to document any changes to the contract milestones or the agile release plan. Finally, celebrate and reward achievement of contract milestones and agile releases as an opportunity to strengthen relationships between service provider and client. Use recognition, appreciation, testimonials, or bonuses to acknowledge value delivered by each party.