Guide

Before Hiring a Consulting Firm

A decision guide for executives about to sign a consulting engagement letter. It covers the gap between the pitch team and the delivery team, the economics of extensions, and the questions that expose a weak proposal before it becomes a weak engagement.

Consulting engagements rarely fail at the pitch. They fail in month three, when the partner who won the work has moved to the next sale and the scope the firm drafted turns out to have been written around what the firm wanted to sell. This guide sets out what to resolve before signature, while you still have negotiating power.

Last reviewed 3 July 2026 · Free and ungated

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Put the shortlisted proposal to selected senior operators from the Global Board, people who have commissioned, delivered and terminated engagements like this one, and receive a confidential report before you commit.

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How a client brief works · What you receive

Why the fee is the smallest number at stake

The visible cost of a consulting engagement is the fee. The larger costs are quieter: six months of your best people staffed onto the programme instead of the business, a recommendation your organisation feels obliged to act on because it paid for it, and the strategic drift that follows a report nobody fully believed. A firm that diagnoses the problem also tends to prescribe work that the same firm is well placed to deliver, which means the engagement letter is not just a purchase but the first move in a longer commercial relationship, on terms set now, when your leverage is highest and your information is worst.

Where buyers of consulting repeatedly look away

The recurring blind spots in consulting purchases are structural, not personal. The partner who impressed the executive team in the pitch is credentialed on the proposal but scheduled elsewhere; the day-to-day work lands with a manager and two analysts you never met. The proposal defines success as a deliverable (a report, a roadmap, an operating model design) rather than an outcome the business can verify. Benchmarks are presented as evidence when they are marketing collateral assembled from previous clients. And a phase-one diagnostic priced attractively often anticipates its margin arriving in the phase-two implementation that phase one tends to recommend.

Put these questions to the firm before signature

  • Name the individuals who will spend more than three days a week on this engagement, and tell us their notice arrangements if they are rotated off.
  • What percentage of your revenue from clients like us comes from extensions and follow-on phases rather than the originally scoped work?
  • Which of your recent engagements in this area did not lead to a recommendation for further work from your firm?
  • If your recommendation is that we should do nothing, or do less, does the engagement structure allow you to say so without commercial penalty?
  • Who in our organisation must change behaviour for your deliverable to matter, and what in your approach addresses them?
  • What will you need from our people, week by week, and what happens to your timeline if they cannot give it?

Stress the proposal, not the credentials

Credentials tell you the firm has done adjacent work; they do not tell you this proposal is sound. Test the scope boundary first: anything ambiguous in the scoping language will be resolved in the change-request process, at your expense. Test the staffing grid against the fee: a blended day rate can conceal a pyramid that is mostly analysts. Test the dependency list: proposals routinely assume data, access and decisions from your side arriving on schedule, and every slip becomes a defensible reason for a fee variation. Finally, test the exit: what do you own, in what form, if you stop the engagement at the end of any month.

What operators who have bought this before will tell you

Executives who have commissioned and terminated consulting engagements read proposals differently from people buying for the first time. They can usually tell within a page whether the scope was written to answer your question or to open a pipeline. They know which methodology language signals genuine capability and which is repackaging. Independent operator perspectives at this stage tend to reveal one of three things: that the problem does not need a firm at all, that it needs a different kind of firm from the one shortlisted, or that the proposal is fundamentally sound but under-specified in exactly the clauses that will be contested later. Any of those three findings, before signature, repays the effort of asking.

Frequently asked questions

How can we verify who will actually deliver the engagement?

Ask for named individuals with committed weekly allocations in the engagement letter itself, not the proposal, and negotiate approval rights over substitutions. Many firms resist this, because staffing flexibility is where much of the margin lives, which is exactly why it is worth insisting on.

Is a fixed fee safer than time and materials?

Not automatically. A fixed fee transfers delivery risk to the firm but pushes the negotiation into scope interpretation, where the firm has more practice than you. Time and materials is honest about uncertainty but needs a hard review gate every few weeks. The structure matters less than who controls the scope boundary.

When is an outside review of a consulting proposal worth the delay?

When the engagement is large enough that an extension would need board approval, when the firm that diagnosed the problem is bidding to fix it, or when nobody on your side has previously managed this type of engagement. A short delay before signature is cheaper than a dispute at month four.

Challenge the proposal before the engagement letter is signed.

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