Marketing channel decisions tend to be made in one of three ways. The first is imitation: a competitor appears to be investing in a particular channel, so the assumption is that the channel must work for businesses in this sector. The second is persuasion: a platform's sales team presents compelling data on reach, engagement, or cost per click, and the case for testing the channel is accepted without adequate scrutiny. The third is trend: the channel is being discussed at industry events, in trade media, and in the marketing team's professional network, creating a sense of urgency to participate before the window of competitive advantage closes.
All three of these approaches share a fundamental problem: they start from the channel and work toward a justification, rather than starting from the business objective and working toward the channel best suited to achieve it. A structured channel evaluation reverses this process — and the decisions it produces are consistently better, both in terms of the channels selected and the resource committed to each.
The five questions of channel evaluation
A rigorous channel evaluation answers five questions before any budget commitment is made. First, is our target audience actually reachable through this channel, in the numbers required to achieve the business objective, at a cost that is commercially viable? Second, what evidence exists — from our own testing, from comparable businesses, or from independently audited case studies — that this channel produces the type of outcome we need, not just reach and engagement? Third, what is the minimum viable test that would tell us whether this channel works for our specific business, and how long would that test need to run to produce a meaningful result?
Questions four and five
Fourth, what does this channel require in terms of sustained investment — creative production, content cadence, management time, agency support — beyond the initial media spend, and do we have the capacity to provide it? Many channels are underestimated on the total cost of running them well. The paid social budget is visible. The creative production cost, the community management time, and the constant testing and optimisation required to maintain performance are often invisible in the initial budget conversation. Fifth, what is the opportunity cost of this channel investment relative to the alternatives — what could we do with the same budget in channels where we already have performance data and established capability?
The right question before investing in a new channel is not "could this work?" Almost anything could work. The question is "is this the best use of this specific budget for this specific objective?"
The test-before-commit principle
Every new channel should be tested at minimum viable scale before a significant budget commitment is made. Minimum viable scale means enough investment to produce a statistically meaningful result — enough impressions to observe a conversion rate, enough email sends to observe an engagement pattern, enough content pieces to observe a search traffic trend — but not so much that a failure is commercially painful. The size of the test varies by channel: paid media tests can be meaningful at £3,000 to £5,000 in spend; organic content tests may require three to six months of consistent publishing before a meaningful signal emerges.
The most common test failure is not that the test produces a negative result. It is that the test is designed at insufficient scale to produce any result — too small a budget, too short a duration, or too unfocused an objective to allow a clear conclusion. A poorly designed test consumes budget, produces ambiguity, and typically results in either a premature conclusion that the channel "does not work" or a premature scale-up before the evidence supports it.
Evaluating ongoing channels as rigorously as new ones
The framework for evaluating new channels should also be applied to existing channels on an annual basis. It is common for channels to remain in the marketing mix long after the evidence for their effectiveness has degraded — because no formal review mechanism requires them to be re-evaluated against current performance and current alternatives. An annual channel audit that asks the same five questions of existing channels as of new ones consistently produces decisions to redirect budget from channels that are producing below potential toward channels that are underinvested relative to their demonstrated return.
Making better channel decisions
The most practical change any marketing team can make to its channel decision-making is to require a written channel evaluation — answering the five questions — before any new channel budget commitment above a defined threshold is approved. This does not prevent testing new channels. It ensures that testing decisions are grounded in clear thinking about audience fit, expected outcome, total cost, and opportunity cost — rather than competitive anxiety or platform persuasion.
The channels that survive a rigorous evaluation are the channels worth investing in. And the budget saved from channels that would not have survived — but that would have been funded without the evaluation framework — funds better tests and deeper investment in the channels that are genuinely worth having.