If you have spent any time in coach training, you have heard "ask open questions" so often it has almost lost meaning. But the open/closed distinction is not a stylistic preference — it is one of the most reliable signals an ICF assessor uses to tell coaching apart from advice-giving in disguise. Worth understanding properly, then.
The difference, with examples
A closed question can be answered with "yes," "no," or a single fact. It narrows. An open question invites the client to explore, and cannot be closed off in a word. Compare:
- •Closed: "Did the presentation go well?" → invites a one-word verdict.
- •Open: "What happened in the presentation?" → invites a story, and the client's own meaning.
Open questions usually start with what or how. ("Why" is open too, but can put clients on the defensive, so use it with care.) The point is not the first word — it is whether the question opens a door or closes one.
Why the ratio matters for ACC and PCC
Open questions do two things ICF cares about deeply. They evoke awareness — they make the client think rather than report — and they keep the client in the driver's seat, doing their own thinking rather than confirming yours. A habit of closed and leading questions quietly steers the client toward where you think they should go, which is the opposite of coaching.
This maps onto two of the Core Competencies in particular: Evokes Awareness and Listens Actively (because a genuinely open question can only be built on what you actually heard). An assessor listening to a recording dominated by closed and leading questions hears a coach controlling the conversation — and that reads differently at PCC, where a higher level of partnership is expected, than at ACC.
When a closed question is the right call
Here is the nuance that gets lost: closed questions are not banned. They have real uses. A confirming question ("So the deadline is Friday?") can establish a fact. A focusing question ("Is this the thing you most want to work on today?") can sharpen the agreement. Asking "Are you okay to keep going?" is good practice, not bad coaching.
It is about pattern and intent, not a rule to never use them. An occasional closed question in service of clarity is fine. A stream of them that does the client's narrowing for them is the problem.
The traps to watch for
- •Leading questions disguised as open: "Don't you think you should talk to her?" has a question mark, but it is advice. The client's only real options are to agree or to argue with you.
- •Stacked questions: firing three at once ("What do you want? And what's stopping you? Is it fear?") overwhelms the client and usually means they answer the easiest, not the deepest.
- •Rhetorical questions: "Wouldn't it be better to just start?" is not a question at all — it is your opinion wearing a costume.
Rewrite cheat sheet
The fastest way to build the habit is to practice the transformation. Here are common closed or leading questions and an open version that does more coaching work:
| Closed / leading | Open rewrite |
|---|---|
| "Did that meeting go badly?" | "What stood out to you about that meeting?" |
| "Are you frustrated with your manager?" | "What's coming up for you when you think about your manager?" |
| "Do you want to talk to her about it?" | "What options are you weighing here?" |
| "Don't you think you should set a boundary?" | "What would a good boundary look like for you?" |
| "Was that the right decision?" | "How do you feel about that decision now?" |
| "Can you finish it by Friday?" | "What would need to be true to finish it by Friday?" |
| "Is this about confidence?" | "What do you make of what's getting in the way?" |
Read the right-hand column aloud. Notice how each one hands the thinking back to the client instead of offering them a verdict to accept or reject.
The space after matters more than the opener
A subtle point that trips up even careful coaches: a beautiful open question still fails if you do not give it room. If you ask "What matters most here?" and then fill the silence two seconds later with "...is it the deadline, or the relationship?", you have just turned an open question into a closed one and answered it for the client. The openness is not only in the words — it is in the pause that follows. Ask, then stop, and let the client work.
How to build the habit
Open questioning is a motor skill, not a fact to memorize. A few ways to train it:
- •Rewrite after sessions. Pick three closed questions you asked and write the open version, like the table above. Do it enough and the open form starts arriving in real time.
- •Count one session. Tally your open versus closed questions in a single recording. Awareness alone shifts the ratio.
- •Default to "what" and "how." When you feel a question forming, start it with one of those words and see where it goes.
Hearing your own ratio
The catch is that almost nobody can count their own questions accurately while coaching — you are too busy listening. That is where structured review helps. Coala analyzes your session and surfaces your open-to-closed question ratio, flags leading and stacked questions, and suggests alternative phrasing — the same kind of rewrite as the table above, but on your actual words. You see the pattern, not just the principle, and you practice smarter, not just more.
Coala is a structured preparation tool, not an official ICF evaluation tool, and it does not replace mentor coaching; it is not affiliated with or endorsed by the International Coaching Federation. To put this to work on a real recording, see our ICF assessment preparation guide, the resources for coaches, or learn how Coala works.