What happens in the private diagnostic?

The private diagnostic is the first two weeks of the Second Chair™ program. It has five parts: an intake with the parent, an intake with the successor, three to five confidential interviews with people the successor will lead, a recorded baseline in three scenarios done cold, and a written diagnostic delivered in week two. It establishes how the successor comes across today and what the six months will work on.

Coaching that starts without this step tends to work on whatever the successor mentions first. The diagnostic exists so the work starts from evidence instead: what the people in the room actually see, what the recording shows, and which events in the next six months matter most.

Why start with a diagnostic at all?

Most successors have a view of their own gaps, and most parents have a different one. Neither is complete. The successor sees the meeting from the inside, where nerves feel larger than they look. The parent sees it from the head of the table, where their own presence changes how the room behaves.

A diagnostic adds two things neither of them has: the view of the people the successor will have to lead, and a recording that shows how the successor actually sounds and looks under pressure. It also fixes a starting point, so that at the end of six months there is something to compare against.

What are the five parts?

1. The parent intake (45 minutes)

A conversation with the parent about the business, the timeline, what they fear and what success would look like in six months. It is a chance to say, to someone outside the family, things that often stay unsaid at home, and it shapes how the rest of the diagnostic is read.

2. The successor intake (60 minutes)

A separate conversation with the successor: their goals, how they see the handover, and where they feel least credible. The two intakes are held apart on purpose. Parent and successor often describe the same handover in very different terms, and each needs room to say it without the other present.

3. Stakeholder interviews (3 to 5 people, 30 minutes each)

Confidential interviews with people the successor will lead: senior executives, a board member, sometimes a sibling. Underneath every interview sits one question: what would make you follow them? These interviews are often where the most useful material comes from, because they reflect the room rather than the family’s view of it. What a stakeholder interview is, and why it matters explains the practice in more detail.

4. The recorded baseline (90 minutes)

Three scenarios, recorded and done cold:

A 3-minute address to the whole company. The kind of moment where the successor speaks for the company rather than for a department.
A 10-minute board update with hostile questions. Including the questions the successor would least like to be asked.
A role-play of a hard conversation. With the parent or a senior executive, on something that is genuinely difficult between them.

“Cold” matters. The point is not to see the successor at their best after a week of preparation. It is to see how they come across when a real board or a real executive surprises them, because that is what the room will see too.

5. The Second Chair™ Diagnostic (delivered in week two)

The written diagnostic brings the four earlier parts together. It contains:

How the successor comes across today, with clips from the baseline.
The three patterns costing them the most authority. Not a long list of everything that could improve, but the three that matter most in the rooms ahead.
The leadership calendar. Every high-stakes event in the next six months: board meetings, the company address, family meetings, investor or press moments. This becomes the practice plan.
What success looks like at month six, agreed with the successor and shared in summary with the parent.

Why three patterns and not more?

Six months is enough time to change a few things thoroughly, and not enough to change everything a little. Narrowing to three keeps the work honest. It also gives the successor something they can remember in the moment, in the middle of a board meeting, which a long list never does.

The patterns are named in terms of behaviour, not personality. “Builds up to the recommendation instead of leading with it” is something a person can change. “Lacks confidence” is not a useful finding.

Why does the leadership calendar matter so much?

Because it turns the program from a curriculum into preparation for real events. A successor who knows the first company address is two months away and a difficult board meeting follows a month later can work towards those moments, rehearse them, and use them as practice. When an event comes up earlier than expected, the work it needs moves forward.

What does the parent see?

The parent has their own intake in week one and receives a summary of the diagnostic in week two, including the agreed definition of success at month six. After that, the parent is kept informed through a thirty-minute briefing each month. What is said in the successor’s sessions stays between coach and successor. What the parent sees during successor coaching sets out every touchpoint.

What happens after week two?

The diagnostic leads directly into the weekly sessions. The first session, in week three, is a debrief: coach and successor walk through the diagnostic together, agree the three patterns and map the leadership calendar to the sessions ahead. What happens in the sessions after that is described in what happens in a successor coaching session.

The baseline does not disappear once the sessions begin. Near the end of the six months, the same three scenarios are recorded again and placed side by side with week two, so the family can see the change rather than take it on trust.

What does the diagnostic not do?

It is not an assessment of whether the successor should lead. The program is for a successor who has already decided to take the role. The diagnostic looks at how they lead, not whether they should.
It is not a psychological evaluation. It looks at observable behaviour in specific rooms: how they speak, answer, decide and hold disagreement.
It does not give investment, tax or legal advice. If the interviews or intakes raise questions about ownership or structure, those belong with the family’s lawyers and advisors.
It is not a report for the shelf. It is the working plan for the six months that follow.

How should a family prepare for it?

Very little preparation is needed, and too much can work against it. A few things help (the full checklist is in preparing for the private diagnostic):

Tell the interviewees why they are being asked. A short, honest explanation from the successor or the parent that the conversation is confidential and part of the successor’s preparation.
Do not coach the baseline. It is meant to be cold. A rehearsed baseline makes the final comparison less useful.
Bring the real calendar. The dates of board meetings, announcements and family gatherings in the coming six months.
Be candid in the intakes. Especially about fears. They shape what success looks like at month six.

Every engagement begins under a mutual NDA, before any of this starts.

In short

The private diagnostic runs over the first two weeks: a parent intake, a successor intake, three to five confidential stakeholder interviews and a recorded baseline.
The baseline is three scenarios done cold: a company address, a board update with hostile questions and a hard conversation.
The written diagnostic names the three patterns costing the most authority, maps the leadership calendar and agrees what success looks like at month six.
The parent receives a summary; the baseline is recorded again at the end so the family sees the change.

Where the diagnostic sits in the six months is shown on the method page.