What Is a Mastermind Group? A Precise Definition

A mastermind group is a small, recurring meeting of peers — typically four to ten people — who report progress on individually stated goals and subject each other’s plans to direct feedback. It is not a support group: support groups optimize for validation, masterminds for candor.

Napoleon Hill Coined It, Not a Marketing Department

Napoleon Hill introduced “Master Mind” in Think and Grow Rich (1937): “the coordination of knowledge and effort, in a spirit of harmony, between two or more people, for the attainment of a definite purpose.” Hill claimed the alliance produced a third, intangible force beyond either person’s own thinking — a big claim worth treating skeptically. What holds up: a small group with real stakes in each other’s outcomes, meeting on a schedule, catches errors solitary planning misses. Hill was describing people who push back, not people who cheer.

What a Session Looks Like

The version that survives past month three has a rhythm: a fixed schedule, monthly or biweekly, an hour or two. Each person gets a timed slot — report what happened, state what’s stuck, take questions. Nobody’s there to sympathize; they’re there to ask the question the presenter has been avoiding.

A founder I’ll call Dana ran a six-person group of agency owners for three years, with one rule: no advice until someone asks a clarifying question first. “People love to solve your problem before they understand it,” she said. “The question forces them to look at what you actually said, not what they assumed you meant.” That single rule is the most transferable piece of the format, and it costs nothing to adopt.

Cost Runs From Free to Five Figures

Paid programs, often run by coaches with an existing audience, commonly range from a couple thousand dollars a year for entry-level cohorts to well over twenty thousand for high-touch versions with vetted membership, retreats, and a paid facilitator. The money buys curation — comparable-stage members — and staying power, since paying customers show up in month four in a way volunteers don’t.

Free, peer-organized versions cost nothing but a calendar slot: pick four or five peers at a similar stage and enforce the format even when attendance dips. Nobody’s paid to keep it alive, so it survives only as long as the members’ own discipline does.

Group Versus a Single Partner

A mastermind isn’t a bigger accountability partner; it’s a different tool. One partner gives a single point of view — miss a check-in and the system pauses until you reconnect. A group of six gives five vantage points on the same problem, with enough redundancy that one bad month doesn’t collapse it. The people around you already shape your habits whether or not you’ve organized them — a mastermind is what happens when you deliberately schedule that influence instead of leaving it to whoever’s nearby.

The cost is coordination: six calendars are harder to align than two, and a meeting can die quietly when everyone assumes someone else is chasing attendance. Neither format wins outright; they trade breadth of feedback for ease of upkeep, and a setup built to last years, not weeks picks deliberately rather than defaulting to whichever is easier to start.

No controlled trial covers masterminds specifically — the nearest evidence is general research on stated commitments, not this format by name. Whether it beats a well-run one-on-one is genuinely unsettled. Better documented is the failure mode: skip the schedule, or let feedback soften into encouragement, and a mastermind becomes a group chat that occasionally feels productive.