Consultative selling: diagnose before you prescribe, with a worked example

This page is for account managers, sales engineers, founders and anyone who sells something the customer could easily buy wrong: equipment, services, software, supplies programs. It explains where consultative selling came from, how it differs from transactional selling, a five-stage process you can follow, the questions that drive the diagnosis, and a worked example in which the consultant recommends the cheaper option.

What consultative selling is and where it came from

The term comes from Consultative Selling by Mack Hanan, James Cribbin and Herman Heiser, published by the American Management Association in 1970 and revised in later editions, including 1973 and 1995. Hanan's version was specific: the seller acts as a consultant to the customer's business, and the measure of a sale is how much it improves the customer's profit. A 2010 appreciation of the book summarized its idea as improving your own profits by improving your customers'.

Today the term is used more loosely for any advisor-style selling that starts with the customer's situation rather than the product. That's fine, as long as the core holds: the diagnosis comes first, and it decides the recommendation.

Consultative vs transactional selling

Neither is better in general. A customer reordering a known product doesn't want a consultation. A customer making a decision they'll live with for years usually does.

The five stages

1. Research before you talk. Learn the customer's business, recent changes and likely priorities from public sources. A consultant who asks "so what do you do?" has already lost the role.
2. Diagnose. Ask about goals, the current state, what's causing the gap and what it costs. Look for the cause behind the symptom the customer brings you.
3. Share what you found. Play the diagnosis back in the customer's words and numbers, and check you have it right. Then lay out the options, including doing nothing.
4. Recommend. Prescribe one option, explain why it beats the others for this customer, and state the expected result as a number with an agreed way to measure it.
5. Follow through. Make sure it's implemented, measure the result, and come back with what you learned. The next sale starts here.

Stages 2 and 3 are where consultative selling differs most from a pitch. Most sellers jump from the first symptom to their product.

Discovery questions for the diagnosis

GOALS
What are you trying to achieve this year in [area]? How will you measure it?
What would make this project a clear success in six months?

CURRENT STATE
Walk me through how [process] works today, step by step.
Where does it slow down or go wrong?

CAUSE
When that happens, what's usually behind it?
What have you already tried, and what did you learn?

COST
What does the problem cost you, in money, time or customers?
What happens if it's still the same next year?

DECISION CONTEXT
What else is competing for budget and attention right now?
Who else will live with this decision, and what do they care about?

For a fuller, structured questioning method, SPIN Selling is the best-researched discovery sequence and fits inside stage 2.

The recommendation memo

Write the recommendation down. A one-page memo forces you to show the diagnosis, the options and the reasoning, and it gives your contact something to forward.

WHAT YOU ASKED FOR:
[the request in the customer's words]

WHAT WE FOUND:
[the diagnosis: cause, evidence and what it costs, in their numbers]

OPTIONS:
A. [option] : cost [ ], expected result [ ], trade-offs [ ]
B. [option] : cost [ ], expected result [ ], trade-offs [ ]
C. Do nothing : cost of the problem continuing [ ]

OUR RECOMMENDATION AND WHY:
[one option, and why it beats the others for you]

HOW WE'LL MEASURE IT:
[the number, the baseline, when we'll check]

Worked example: a sterilizer that wasn't the problem

Illustrative example. Harborline Dental Supply, Maple Street Pediatric Dentistry, the people and every figure are fictional, to show the method.

The seller: Harborline Dental Supply (harborlinedental.example), a dental supply distributor with an equipment team. The customer: Maple Street Pediatric Dentistry (maplestreetpeds.example), three dentists and ten chairs, open four days a week. The request: the office manager, Teresa, asked for a quote on a second sterilizer because "chairs keep waiting for instruments".

Research. The practice added its third dentist this year, according to its website. More patients, same instrument setup: a likely cause, but not yet a diagnosis.

Diagnosis. The consultant spent a morning in the sterilization area and asked Teresa for the sterilizer's cycle log. Three findings:

The cost, in Teresa's numbers. Six waits × 8 minutes is 48 minutes, about 0.8 chair-hours a day. At the practice's figure of $310 of production per chair-hour, that's about $248 a day. Over 192 clinical days a year (four days a week for 48 weeks), it comes to about $47,600 a year.

Options shared with Teresa and the lead dentist:

Recommendation. Option B. If it removes 80% of the waits, it recovers about $38,100 a year ($47,600 × 0.8), and pays back in about three months ($9,600 ÷ $38,100 = 0.25 years). Revisit the second sterilizer when the practice adds a fourth dentist, when the cycle log shows the machine running near capacity. Agreed measure: assistants keep logging waits for four weeks after the cassettes arrive, against the same log from before.

The consultant sold $9,600 of instruments instead of $15,700 of equipment. Four weeks later the log showed one wait a day, down from six, and the practice asked the same consultant to plan the fourth operatory.

What made this consultative: the request was treated as a symptom, the diagnosis used the practice's own records, the do-nothing cost was on the table, and the recommendation came with a way to check it worked.

How consultative selling compares

When consultative selling fits and when it doesn't

It fits when the cost of a wrong choice is high, the customer's needs vary, you have expertise across many similar customers, and you want a long relationship rather than one order.

It's a poor fit when the customer knows exactly what they want and is comparing prices, when the product is simple and standard, or when you can't afford the time a diagnosis takes for the size of the sale. In those cases, quote quickly and well: that's good service too.

Self-check: are you selling consultatively?

• You researched the account before the first conversation.
• You can state the customer's problem, its cause and its cost in their numbers.
• You played the diagnosis back and the customer agreed with it.
• You showed at least two options, including doing nothing.
• You'd make the same recommendation if you weren't paid on it.
• You agreed a measure and a date to check the result.

Common mistakes

• Calling a pitch a consultation. Asking three questions and then presenting the standard offer isn't consultative.
• Treating the request as the diagnosis. "We need a second sterilizer" is a symptom report.
• Hiding the cheaper option. Customers usually find it later, and the trust doesn't come back.
• Recommending without numbers. "This will help" isn't a recommendation. "This should recover about $38,000 a year, and here's how we'll check" is.
• Disappearing after the sale. Follow-through is where the next recommendation is earned.

Stage 1 is the part most sellers skip under time pressure. Bebop researches each account and writes a playbook with what's happening at the company and who to talk to, so your first conversation can start at stage 2.

Next step: plan your diagnosis, with the questions and the numbers you need to collect, using the free sales call planning template.