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Measurement & growth · Practical guide

Marketing ROI: distinguish attribution from arithmetic

Marketing ROI compares an appropriately defined return with the associated cost. The arithmetic is straightforward, but attribution and cost coverage need care. State whether the return is revenue, gross profit or another measure, and do not switch definitions between reports.

Understand the decision

A marketing channel can influence a decision without being its only cause. Use an agreed attribution approach and describe what the available evidence can support.

The useful starting point

Choose the business outcome and include the relevant delivery, media, content and internal costs. Label incomplete cost information rather than presenting a partial figure as a full return.

A practical workflow

Work through the sequence below. Keep the evidence, the change you make and the acceptance check together so the next person can understand the decision.

01

Define the return and costs

Choose the business outcome and include the relevant delivery, media, content and internal costs. Label incomplete cost information rather than presenting a partial figure as a full return.

02

Document attribution assumptions

Explain how an enquiry or sale is assigned to the campaign. Separate directly observed sources from self-reported and modelled contributions.

03

Review scenarios and actuals separately

Use estimates for planning and observed business records for retrospective reporting where available. Account for the timing between marketing work and completed business.

Workflow: Define the return and costs; Document attribution assumptions; Review scenarios and actuals separately
A visual summary. The explanation above supplies the context and qualifications.

Illustrative scenario

What this looks like in practice

A report shows campaign cost and attributed gross profit using an agreed method, while separately recording sales still in progress. It does not call all revenue from customers who visited a guide the exclusive result of that page.

This is a worked example, not a claim about a client campaign or a promised result.

Before you sign it off

Do not confuse revenue-to-cost ratio with profit-based ROI. Do not hide uncertain attribution behind a precise percentage.

Keep a useful decision record

Purpose
Write the customer task this change is meant to improve.
Evidence
Save the relevant page, source or observation and its date.
Owner
Identify who implements the change and who verifies it.
Acceptance
State what a correct result looks like before measuring its wider effect.

What to measure

Track agreed return, complete relevant costs, attribution coverage and the difference between planning estimates and observed outcomes.

Record the baseline and the observation window. If the measurement setup changes, annotate the report before comparing periods. Use the findings to choose the next useful improvement, rather than treating one encouraging result as proof of a permanent outcome.

Sources and further reading

These primary references provide platform guidance and context. The workflows and scenarios on this page are editorial explanations; a source link does not turn an example into a measured result.

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