New themes stop appearing after a knowable number of calls. Commercial diligence saturates later than a channel check, and each additional geography adds calls before the picture stops moving — the count is set by how many distinct positions exist in the market.
How many expert calls is enough?
Enough that the next conversation stops surprising you. That is the only honest way to scope a run of expert calls. That is not a rhetorical answer — it is an observable point, and it arrives at a fairly consistent count for a given kind of question rather than for a given size of deal.
The mistake in most scoping conversations is treating call count as a function of deal value. A hundred-million-dollar asset in a market with four distinct operator positions saturates faster than a small asset in a fragmented one.
What does saturation actually mean?
The point at which additional interviews stop producing themes you have not already heard. It is borrowed from qualitative methods and it is the only defensible stopping rule available, because every alternative — a fixed count, a budget, a deadline — is arbitrary with respect to the question.
It is also observable in real time if someone is coding as the program runs. A team that reads its transcripts at the end cannot see saturation; it can only assert it afterward, which is one argument for a moderator who codes as the program runs.
Coding is what converts saturation from a claim into an observation. It does not need to be elaborate — a running list of themes, with a mark against each conversation that raised one, is enough to show when the list stopped growing. The value of doing it live rather than at the end is that the decision to book three more calls or to stop is made while booking is still possible.
Which projects need more calls?
Commercial diligence needs more than a channel check, because it tests several hypotheses at once and each needs its own coverage. A single-question check on whether a distributor's terms have changed saturates quickly.
Fragmentation matters more than sector. A market with two dominant channels and one route to the buyer saturates fast; one with regional distributors operating differently in each state does not.
What does a second market add?
Close to a second project, not an extension of the first. Markets rarely behave as variants of one another, and the assumption that they do is the single most common cause of a research budget running out at eighty percent completion.
The exception is where the same multinational operators run both markets on a common model, which is rarer than deal teams expect and worth establishing early rather than assuming.
When should you stop booking?
Scope to a band, review at the midpoint, and decide with the coding in front of you. That is a more honest structure than committing to a number at kick-off, and it is easier to defend to whoever approves the budget — the same standard an investment committee applies to the evidence itself.
Under-scoping does not produce a cheaper answer. It produces a provisional one, held with unearned confidence, and the cost of that shows up later in the process rather than in the research line.
The band should be quoted with what would move it. A scope that reads twelve to eighteen calls, with the upper end triggered if the second market turns out to run on a different channel structure, gives whoever approves it something to decide rather than a number to accept. It also makes the midpoint review a scheduled event rather than a request for more budget.