Media buying agencies ninety day plan: from truth to handover

The media buying agencies ninety day plan should create control before speed. A new agency needs to understand the brief, secure authorised access, validate measurement and expose decisions that the pitch left open. Calendar dates are useful, but entry and exit criteria matter more than ceremonial milestones.

What to take away

Days 1 to 15: establish the operating truth

Confirm the client entity, decision owners, scope, England locations and channels. Inventory every platform account, tag, audience, publisher agreement, data feed, dashboard and invoice route. Record who owns each asset and whether the agency has the access its proposed work requires.

Reconcile the appointment with the signed brief. The IPA's client briefing guidance and the ISBA/IPA media services framework set the basis for shared understanding. Note any difference between that document, the proposal and the final contract, then seek a named decision.

Do not copy legacy audiences or exclusions automatically. Check their source, permission, refresh date and geography. PECR and UK GDPR govern cookie, pixel and related advertising uses in the United Kingdom; the ICO's storage and access technologies guidance covers the technical rules, and the ICO register of fee payers confirms whether the client's data-processing registration is current. Qualified reviewers should assess the actual implementation against these instruments.

Days 16 to 30: repair the evidence chain

Create a measurement dictionary for every reported field. Identify the system of record (GA4, the ad server, the CRM), attribution rule, reporting lag and person accountable for data quality. Run controlled checks on conversion routes before using them for optimisation. Google Ads conversion tracking documentation sets out the available approaches; the applicable configuration still depends on the advertiser's setup and consent design.

Review audience evidence and label geography. UK research from Ofcom, Barb or RAJAR can inform UK planning, but it cannot be described as a UK-wide result unless the cited cut supports that statement.

Days 31 to 45: settle channel roles

Write a one-page strategy connecting outcome, audience, channel task, buying choice and measure. Test whether creative assets suit each placement. Create scenarios where inputs are uncertain, and mark platform forecasts as estimates.

Resolve overlaps. Decide which channel builds reach, which captures demand and which supports frequency or location. Agree what evidence would justify moving allocation, and protect any channels that require enough time or weight for interpretation.

Days 46 to 60: approve controlled activation

Turn the strategy into buying instructions with inventory, geography, dates, exclusions, change authority and escalation contacts. For programmatic activity, map the participants across DV360, The Trade Desk and the ad server, and their commercial route. IAB UK's programmatic guide introduces the roles and auction mechanics relevant to that map, and the IAB Europe Transparency & Consent Framework is a voluntary standard to assist compliance with data protection law.

Hold a readiness review involving media, creative, analytics, privacy and finance owners. A launch should wait if critical access, measurement or approval remains unresolved.

Days 61 to 75: operate and investigate

Monitor delivery against the approved plan, but resist reacting to every short-term movement. Triage discrepancies by materiality: tracking failure, unsuitable placement or geographic leakage across UK regions deserves prompt investigation; normal reporting latency may not.

Keep a change log showing previous setting, evidence, decision maker and expected consequence. Tell the client about material departures while a choice still exists.

Days 76 to 90: review and hand over

Compare intended and actual delivery using the definitions agreed at the start. Separate platform-reported activity, audience-currency evidence and advertiser outcomes. Reconcile invoices, credits and approved changes. ISBA's agency contract compliance guidelines offer UK advertiser guidance on financial records and audit access; verification providers such as DoubleVerify or Integral Ad Science supply independent evidence on viewability and brand safety.

Close with a decision session, not a victory presentation. Retain what is supported, stop what breached its conditions and identify the next uncertainty worth testing. Archive the strategy, permissions, exports, invoices and change record so the ninety-day work becomes an operating baseline rather than lost onboarding history.

Before you act

Common questions

What should an agency do in the first fifteen days?

Confirm the client entity, decision owners, scope, UK locations and channels. Inventory Google Ads MCC, Meta Business Manager, DV360, The Trade Desk, GA4, the ad server, tags, audiences, publisher agreements, data feeds, dashboards and invoice routes. Record who owns each asset and whether the agency has the access its proposed work requires. Reconcile the appointment with the signed brief under the ISBA/IPA media services framework.

How should an agency handle measurement and evidence?

Create a measurement dictionary for every reported field. Identify the system of record, attribution rule, reporting lag and person accountable for data quality. Run controlled checks on conversion routes before using them for optimisation. Review audience evidence and label geography, using UK research only as the cited cut supports.

What should happen in the final fifteen days of the ninety-day plan?

Compare intended and actual delivery using the definitions agreed at the start. Separate platform-reported activity, audience-currency evidence and advertiser outcomes. Reconcile invoices, credits and approved changes. Close with a decision session, not a victory presentation, and archive the strategy, permissions, exports, invoices and change record.