Check-ins are the thermometer at the start of a meeting. Cheap to run, and they tell you whether the agenda you planned is the meeting the room is ready for.
A check-in is a short, structured prompt that gives every participant a chance to register their state before the meeting starts. ESVP, weather, a one-word check-in, energy 1-10 — they all do the same job. The output isn't the conversation; it's the signal. Treat the check-in as decision input, not ritual: if the signal says half the team is checked out, that's a planning input, not a discussion topic. The format matters: anonymous check-ins surface different data than open ones, numeric scales produce trends, categorical labels produce decisions.
Top of every retro. Top of any meeting where the room's mood will shape the outcome — planning sessions, post-incident reviews, the first call after a difficult release. Skip them on stand-ups and short status calls; the overhead isn't worth it. Skip them when you're not willing to act on what you find — a check-in you ignore is worse than no check-in at all. And don't run all three (one-word, temperature, niko-niko) in the same meeting; that's overhead theatre. Pick one for the job at hand.
A thermometer for the room. If half the team voted Prisoner, you're running the wrong meeting.
The cheapest diagnostic that exists. Treat the word as data, not warm-up.
A barometer with a half-life. Anonymous extends the runway; rotating the question keeps it sharp.
A longitudinal mood format dressed as a daily ritual. One day's dot is nothing; six weeks of dots is the format.