An account review is the moment a client stops treating a supplier relationship as settled and reopens it to competition, on terms that make the incumbent argue its case again as though it were a stranger. Ford's review of its relationship with WPP is a useful example of the pattern, because the mechanics of that kind of review are the same whether the client is a carmaker or a mid-market firm reassessing its lawyers: the client sets a process, invites challengers in, and the incumbent's history stops counting for as much as it used to.

The review itself is the warning

By the time a client formally opens a relationship to review, the decision to at least consider a change has usually already been made somewhere upstream. The review is not neutral fact-finding; it is the visible stage of a process that started earlier, often with a change of marketing leadership, a cost pressure from elsewhere in the business, or a quiet build-up of frustration that never reached a formal complaint. An incumbent that treats the announcement of a review as routine has already lost time it cannot get back.

What incumbency buys, and where it stops paying

Holding the account buys an incumbent access, familiarity with the client's internal politics, and the benefit of the doubt on delivery. None of that buys immunity from a review, and it can work against the incumbent once one starts: familiarity reads as complacency, and long tenure invites the question of whether the account has been coasting on the relationship. A challenger's task is not to prove it is cheaper or more creative in the abstract. It is to show the client something the incumbent has stopped noticing about its own account.

What the challenger does differently

The agencies that take business away from a comfortable incumbent tend to do a small number of things well. They research the client's actual pressures, they build relationships with more than one stakeholder before the room decides, and they name specifically what the incumbent has stopped doing. The guide on preparation covers how to research an incumbent before a pitch in more detail, and targeting covers how to judge whether a review like this is worth pitching for at all.