The launch date is in the sales presentation. Nobody has checked whether the approval, supplier input and preparation can fit before it. To assess a fixed project deadline, work backwards from the result that must be accepted, confirm the essential sequence and compare its latest feasible start with actual availability.
This is a feasibility check before a promise. It will not make an impossible date achievable, but it can identify the decision while useful options remain. PMI discusses reverse planning for fixed-deadline projects; the simple method below is an illustrative way to start that conversation.
What must be ready on the fixed date?
Describe the usable result, its recipient and acceptance evidence. Distinguish a complete operational service from a demonstration or an internal draft. If those outcomes are interchangeable in the plan, the date has no stable meaning.
Check why the date is fixed. A genuine external event, an agreed commercial commitment and an internal preference have different consequences. Ask the appropriate owner to confirm any contractual or regulatory interpretation rather than making it yourself.
Build a latest-start check
List the indispensable predecessor results in reverse order. For each, record:
Result needed and who accepts it.
Realistic duration and the evidence behind it.
Relevant working calendar and review availability.
Input that must exist before work starts.
Latest finish and latest start under the current assumptions.
Decision needed if that start is no longer available.
Account for waiting as well as active effort. An approval needing two days of reviewer availability cannot be squeezed into a weekend merely because the production work is finished.
A hypothetical backwards calculation
Suppose a client event is on Friday. The accepted materials need to be ready Thursday, after two working days for an agreed review and correction cycle. Production needs three working days after the approved brief.
Under those simplified assumptions, the brief must be accepted by the previous Thursday evening for production to start Friday. Actual calendars, holidays and review cut-offs could change the answer. If the brief will arrive Monday, the plan needs a decision, not a more confident arrow on the timeline.
The sponsor might approve a narrower event deliverable, arrange a genuinely feasible alternative sequence or change the commitment through its authorised route. Removing the review without understanding its purpose is not an equivalent recovery option.
Show what would change your answer
Identify the assumptions controlling feasibility. Who must confirm the supplier date? Which acceptance condition could legitimately change? What is the last useful date for choosing an alternative?
Keep the original commitment visible beside the forecast. Explain what is known, what remains conditional and which option the business must authorise. Do not turn a calculated latest start into a guarantee that uncertain work will finish exactly as estimated.
The small-team project planning guide provides the wider plan around this deadline check. For the connected task, read How to Write Project Acceptance Criteria People Can Actually Check. If a promised date is approaching without a credible route to delivery, discuss your project requirements.
