> ## Documentation Index > Fetch the complete documentation index at: https://docs.b2bsignals.ai/llms.txt > Use this file to discover all available pages before exploring further. # How it works > The B2B Signals loop from sources to reports, including what sends a message, what doesn't, and how someone gets into a campaign. Use this page to see how the parts of B2B Signals fit together, and which actions reach another person. ## The loop **1. Sources find people** [Sources](https://docs.b2bsignals.ai/sources/overview.md) bring people in. Radar, our AI, looks for people with a reason to hear from you. Watchlists follow people and companies you choose. You can also add people yourself. Nothing is sent at this step. **2. People holds everyone** Everyone lands in [People](https://docs.b2bsignals.ai/people/overview.md), with the reason they came up and a stage that shows where they are with you. ![People table with the All, To review, Ready and In outreach tabs, each row showing a reason, source and stage](https://mintcdn.com/b2-b-signals-llc/u5yYe4FZtFc5vtD_/images/people/people-table-bulk.png?fit=max\&auto=format\&n=u5yYe4FZtFc5vtD_\&q=85\&s=cc5c1fd9725a75154d17388cd0655e86) People: the tabs All, To review, Ready and In outreach, with a reason and a stage on every row. **3. You review them** People from a source with review turned on wait in **People** › **To review**. You [mark each one](https://docs.b2bsignals.ai/people/review.md) **Good fit** or **Not a fit**. Radar learns from your answers. **4. Campaigns write to them** A [campaign](https://docs.b2bsignals.ai/campaigns/overview.md) is a set of steps, such as an invite, a message and a follow-up, sent from one of your [senders](https://docs.b2bsignals.ai/help/glossary.md#sender). Each campaign starts a limited number of new people a day. **5. You approve what goes out** Depending on the campaign, messages wait in [Approvals](https://docs.b2bsignals.ai/campaigns/approvals.md) for your yes. If a sender has no connected LinkedIn, they wait in [Manual sends](https://docs.b2bsignals.ai/campaigns/manual-sends.md) for you to send by hand. **6. Replies land in your Inbox** Replies come into the [Inbox](https://docs.b2bsignals.ai/workspace/inbox.md), and the person's [stage](https://docs.b2bsignals.ai/people/stages.md) moves on its own. **7. Reports show what worked** [Reports](https://docs.b2bsignals.ai/workspace/reports.md) show replies and results, so you can adjust your brief and your campaigns. Then the loop goes on. ## Good fit and campaigns > [!WARNING] > > Marking someone **Good fit** doesn't put them in a campaign unless a route is set. Without a route, they wait in **People** › **Ready** until you add them yourself. **Good fit** says you'd like to write to this person. It also teaches Radar to bring more people like them. It never sends a message by itself. When you mark someone **Good fit**, we check whether an active campaign would have taken them on its own. They join if one of these routes applies: | Route | Example | | - | - | | An active campaign uses a list the person is on | A campaign on the list Radar adds new people to (see [Where new people go](https://docs.b2bsignals.ai/sources/radar.md#where-new-people-go)), with **Keep adding people from the lists** turned on | | Your First campaign from sign-up | Radar sends the people you mark **Good fit** to it, as long as the campaign is active | | An active campaign tied to the Smart Agent that found them | Only for older [Smart Agents](https://docs.b2bsignals.ai/sources/smart-agents.md) | Your plan must include sending, and every other check still applies. Someone on [Do not contact](https://docs.b2bsignals.ai/people/do-not-contact.md), or already in another running campaign, doesn't join. ### How to tell what happened Read the message that appears after you mark someone on their page: * If it ends with "Added to a campaign automatically.", the person joined a campaign. * If it doesn't, no route applied. The person is in **People** › **Ready**. To write to someone in **Ready**, select them, click **Add to campaign** and choose a campaign. We check everyone first and tell you who would be skipped and why. See [Add people to a campaign](https://docs.b2bsignals.ai/campaigns/add-people.md). ![Add to a campaign dialog: 4 people will be added, 2 will be skipped, with the reasons In another campaign and Waiting for your review](https://mintcdn.com/b2-b-signals-llc/u5yYe4FZtFc5vtD_/images/people/add-to-campaign-why.png?fit=max\&auto=format\&n=u5yYe4FZtFc5vtD_\&q=85\&s=6c8f69a63cf3e6a92166a7def76f4394) The check before anyone joins: 4 will be added, 2 skipped, with each reason under why?. ### When review applies Each source has its own review setting. | Source | Review new people first? | | - | - | | Radar | On by default | | Every other source | Off by default | While review is on, a person whose stage is still New can't start a campaign, even if you add them by hand. Mark them **Good fit** first. This only affects the first message of a campaign. With review off, people can join campaigns without being marked. A campaign can still ask for more through **Who joins on their own** in its settings, for example **Only people I marked Good fit**. A person has to pass both the source's review and the campaign's rule. **Good fit** passes both. Joining a campaign doesn't mean the first message goes out that minute. Everyone waits for their day, based on the campaign's **New people a day** and its sending days. ## What sends a message | You do this | Does it send anything? | Can you undo it? | | - | - | - | | Finish your brief or change it | No | Yes, edit it again | | Mark someone **Good fit** | Not by itself. It can start a campaign if a route applies, and that campaign's approval rule then decides. | Yes, click **Undo**. Their opening message is taken back unless you edited it. | | Mark someone **Not a fit** | No. It stops any campaign running for them. | Yes, but stopped campaigns don't resume. Add them to a campaign again. | | Click **Add to campaign** | Not right away. They wait for their day. | Yes, remove them from the campaign | | Launch a campaign | Yes, on its schedule, unless messages wait for your approval | Yes, pause it. Anything already sent stays sent. | | Click **Approve** on a message | Yes, at the next allowed time | Yes, click **Undo** within 12 seconds, unless it has already started going out | | Click **Mark as sent** in **Manual sends** | No. You send it yourself on LinkedIn. It tells the campaign to go on. | See [Manual sends](https://docs.b2bsignals.ai/campaigns/manual-sends.md) | | Connect a sender | No | Yes, disconnect it | ## Who decides when messages go out Each campaign has its own approval setting, shown when you launch it: **You approve every message**, **You approve once per person**, **You approve each person's first message** or **Messages send without your approval**. Your First campaign from sign-up uses the first one. [Safety limits](https://docs.b2bsignals.ai/campaigns/senders-and-limits.md) apply on top. A sender has daily limits and sending hours, and a new sender starts slowly. Some problems [pause sending on their own](https://docs.b2bsignals.ai/campaigns/safety-pauses.md). ## Related > [card] [Review people](https://docs.b2bsignals.ai/people/review.md) > > Good fit, Not a fit and what each one does. > [card] [Add people to a campaign](https://docs.b2bsignals.ai/campaigns/add-people.md) > > Every way someone gets into a campaign. > [card] [Stages](https://docs.b2bsignals.ai/people/stages.md) > > Where each person is with you. > [card] [Troubleshooting](https://docs.b2bsignals.ai/help/troubleshooting.md) > > Why someone was skipped or nothing is sending. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.