Most consulting engagements that go wrong went wrong before the engagement started. These five questions will catch 80 percent of the failure modes before money changes hands.
1. What decision will their work help us make?
If you cannot answer this in one sentence, you are not ready to hire a consultant. A consultant's output is only valuable if it feeds a decision you were going to make anyway. "We want to understand our market better" is not a decision. "We need to decide whether to enter Tier 2 cities in the next 12 months" is.
Ask the candidate consultant: "Given that decision, what will your output look like?" A good consultant reframes the decision if needed and describes a deliverable tied to it. A bad consultant promises "insights."
2. Who exactly will do the work?
At boutique firms and with independents, the partner who sells is often the partner who delivers. At larger firms, this is frequently not true. Ask plainly: "Will you personally be doing this work, or will it be a team, and who is on that team?"
Then ask to meet the team. If you cannot meet them, or if they are not yet hired, that is a red flag.
3. What is the smallest version of this engagement?
A good consultant will say "we could do a two-week diagnostic first to confirm the scope before committing to the full 12 weeks." A bad consultant will push for the full fixed-fee project on day one.
The diagnostic-first model protects both sides. The client spends 10–15 percent of the full fee and decides whether to proceed. The consultant gets paid for the work, even if the engagement does not extend.
4. What does "done" look like?
Not "what will you deliver." What does "done" actually look like on the last day? Who will be in the room at the final presentation? What will be different at the company as a result of the work?
Consultants who struggle with this question are usually thinking in terms of their output, not your outcome. You want the consultant who describes your outcome.
5. What are your references I can call tomorrow?
Three names, three phone numbers, all reachable. At least two should be clients where the engagement ended more than 6 months ago. Six months out, the fog has cleared on whether the work actually created value.
When you call, ask three specific questions: - What did they do well? - What did they do badly? - Would you hire them again?
The "would you hire them again" question is the most honest. If the reference hesitates, that is the answer.
The Question You Should Not Ask
"What is your methodology?"
Nine out of ten consultants will answer this with a slide. The slide is meaningless. Methodologies are a way of describing past work; they do not predict future value. Skip it.
A Summary
The five questions, compressed: 1. What decision will their work help us make? 2. Who exactly will do the work? 3. What is the smallest version of this? 4. What does "done" look like? 5. Who are your references I can call tomorrow?
If a consultant cannot answer all five clearly, look elsewhere. Preconsultify vets every consultant on the network against exactly this filter. When you receive a shortlist, you can ask these five questions and get clear answers in the first chemistry call.
