A fixed-price project works when the scope is honest. That means both sides know what will be built, what will not be built, who provides content, who approves each milestone, and what handover includes.
Start with the outcome
The scope should begin with the business outcome, not the feature list. A website might need better inbound enquiries. A system might need faster approvals. An AI tool might need fewer support hours. The outcome sets the boundary.
Write down the edges
Good scope documents make edges visible. They define page counts, integrations, roles, admin access, content responsibilities, revision rounds, support windows, and what happens when new ideas appear mid-project.