Validate Requirement Changes Before Updating the Plan
Track old and new buyer requirements with a worked weekly-file versus daily-exception example, checking scope, evidence, tests and unapproved consequences.
10/24/20263 min read
A requirement can change after discovery for good reasons. The buyer may learn something new, narrow the project or discover a constraint. The risk is not the change itself; it is leaving earlier assumptions in proposals, tests and implementation plans as though nothing happened.
Use a requirement-change record that captures the new direction and its consequences without treating every revision as a negotiation conflict. The seller should understand the change before promising that the same price, timing and solution will still apply.
Preserve the old and new meanings
Record the original requirement, its source and the replacement wording. Ask whether the new statement supersedes the old one or adds an exception. A buyer who changes one team's scope has not necessarily changed the whole organization's requirement.
Identify who confirmed the revision and whether they have the relevant responsibility. Do not interpret a casual comment from one attendee as an approved organization-wide change. Where authority or scope is unclear, keep the revision proposed until the appropriate owner confirms it.
Worked example: from weekly file to daily review
Fictional buyer Cedar Operations initially requests a weekly account-review file. Later, the project lead says the team needs a daily view of urgent exceptions, while the complete account file can remain weekly. The seller's first reaction is to change the entire export frequency to daily.
The completed change record instead separates two requirements. Existing weekly file: retained for the full review. New daily exception view: proposed for a defined subset, with urgency criteria still to be confirmed. Affected dependencies include source freshness, ownership of exception review, supported delivery method and ongoing effort.
The team now has a useful clarification question: what makes an account urgent, and who acts on the daily view? It does not promise a daily automated export before verifying the tool capability and workload. A small approved sample can test the new distinction without changing the original deliverable prematurely.
Trace the downstream effects
Check scope, acceptance criteria, data needs, access, technical design, timing and price. Not every change affects every category, but the review should make that conclusion explicit. A requirement that seems small in wording may create new personal-data processing or a significant maintenance task.
Update the relevant test cases too. If the acceptance test still checks only the weekly file, it cannot establish that the daily exception requirement is satisfied. Keep superseded tests identifiable so a later reviewer understands which version of the requirement they address.
Avoid silent concessions and silent resistance
Do not accept the change informally while leaving delivery to discover the extra work. Equally, do not preserve the old plan because it is more convenient and assume the buyer will adapt. Explain the actual impact and the options: revise scope, investigate first, defer the new requirement or decide that the project no longer fits.
A commercial change may need explicit approval under the relevant agreement. The sales note should not substitute for that process. Until approved, use proposed language rather than presenting new fees, deadlines or obligations as settled.
Confirm the shared version
Send the agreed summary through the appropriate route and make correction easy. State what changed, what stayed the same and what remains open. Do not treat silence as acceptance of a material new commitment.
The final artifact links the current requirement to its evidence, affected decisions and accepted next steps. Provenance supports that traceability, while privacy review may be needed if the new scope changes data use. A clear change record lets both parties adapt without losing the history that explains the project. It also prevents a successful test of yesterday's requirement from being presented as proof that today's different requirement has been met.