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The Closer’s Manifesto

Big Sister AI
The AI method for closers
v2.0 / September 2026

Every sales leader has the same wish: a team that takes care of itself. Instead, you review a handful of calls a month and manage everyone else on faith. We built Big Sister to end that: every closer and every AI agent measured against one standard, with the evidence attached. Not so you can watch harder. So you can stop watching and start trusting.

CRM is the record. Your recorder is the tape. Big Sister is the method and the referee that scores every game.

01

We are for closers.

Our work starts at the first real conversation with a real buyer and ends when the deal is won or lost. That is where revenue is decided, and that is the only room we want to own.

02

We build AI around the humans, not instead of them.

A human and an AI on the same deal, held to the same standard. The human owns the customer. The AI gets exactly the surface area the human decides to give it.

03

The method comes first. The software serves it.

Since 2009 we have built sales processes inside real teams. All of it went into the Big Sister Method. The app exists to run the method. Not the other way around.

04

One standard. Every rep, every agent, every interaction.

One written Sales Score Standard, graded against a rubric with reference examples. A human closer and an AI agent get the same rubric, the same feedback, the same scoreboard.

05

We don’t return a number. We return the evidence.

Every score cites the moment that earned it, and any rep can dispute it to a trained human referee. A score you cannot check is an opinion with a decimal point.

06

We publish the number that doesn’t flatter us.

We measure our scorer against trained experts and publish the agreement, including where a human still wins. The claim is coverage: expert judgment on every conversation.

07

The AI you put in front of customers plays to the same standard as your people.

Same rubric, same evidence, same appeal, including for our own agents. Before an agent talks to your customers, it passes the same standard your reps do.

08

The method learns from your results, not ours.

Your playbook, your skills, your CRM outcomes, and a loop tuned to what moved your conversion rates. Open about the method, closed about the engine.

09

The score is what makes everything else possible.

Coaching without a score is a pep talk. With one, a rep can replay the exact moment, and an agent can be handed the parts of closing you choose. You keep the relationship. We keep the quality.

THE ASK

Give us your closers’ recorded conversations.

From Fireflies, Zoom, Meet or your CRM. Within days you get a Sales Score per rep, with the evidence behind every number. Then decide.

Nine principles. One standard. Humans and agents on the same scoreboard.
Read the full manifesto at big-sister.ai/manifesto
big-sister.ai
Austin, TX, US