The document discusses the key phases in managing a fixed-cost project: pre-sale, planning, implementation, and finishing. In the pre-sale phase, it is important to understand customer needs, estimate the project scope and costs accurately including buffers, and identify risks. During planning, communication and acceptance criteria should be established. In implementation, risks are reviewed, small changes are managed, and regular reporting keeps the customer informed. The finishing phase involves acceptance testing, maintenance proposals, and knowledge sharing for future projects. Aspects of Scrum like sprints and daily standups can also help manage fixed-cost projects.