A milestone should represent a useful, reviewable outcome. “Work is 50% complete” is difficult to assess. “The agreed prototype passes these five user scenarios” gives both sides something concrete to inspect.
Organise work around decisions
Break the project into stages that reduce uncertainty or produce something the next stage needs. A consulting assignment might move from discovery to analysis, recommendations and handover. A development project might move from an agreed flow to a working implementation and release checks.
Avoid making every minor activity a separate milestone. Too many approvals can slow work without improving control.
Define the evidence of completion
For each milestone, write the deliverable, reviewer, acceptance checks and review period. Include the information or access the client must provide. State how feedback is consolidated so the specialist does not receive conflicting instructions from several people.
An illustrative acceptance check for a reporting tool is: “The totals match the agreed sample records for the specified reporting period, and each user role sees only its authorised data.” This is clearer than “dashboard completed.”
Plan changes and handover
Decide how new requirements are recorded and priced. If a request changes the agreed outcome, assess its effect on time and cost before treating it as part of the current milestone.
Business-planning resources such as those from the SBA can inform overall goals, but the project's acceptance criteria should be specific to your work.
The final milestone should include source material, operating instructions and ownership of relevant accounts. Use a structured project brief to agree these details before work starts, rather than discovering missing handover items at the end.