What Is a Single Source of Truth?
A single source of truth (SSOT) means each fact your business depends on lives in one system, and everything else reads it from there. When two systems both hold the same fact, they eventually disagree, and someone has to decide which one is right.
It does not mean one system for everything. It means one home per fact.
Which System Should Own What?
| Fact | Its usual home |
|---|---|
| Customers, contacts, deals, and sales activity | The CRM, such as HubSpot or Salesforce |
| Invoices, payments, and revenue | The accounting system |
| Orders, projects, inventory, and delivery | The ERP or operations system |
| Employees, payroll, and roles | The HR or payroll platform |
| Targets and forecasts | One agreed spreadsheet or planning tool, not one per person |
The systems meet at the handoffs. A deal is won in the CRM, the order or project starts in the ERP, and the invoice goes out from accounting. Each handoff is a place where two systems can start to disagree. At a managed service provider, for example, the deal closes in the CRM and the new client is set up in the PSA before service starts.
Why Do the Numbers Stop Agreeing?
Usually because keeping each system current is extra work that nobody has time for. A call never gets logged. An order changes in an email thread and the ERP hears about it a week later. Someone keeps the real forecast in a spreadsheet.
Then the monthly report and the people closest to the work tell two different stories, and the leadership meeting turns into reconciling them. That gap is a data silo.
How to Keep Your Numbers Worth Trusting
- Decide which system owns each fact, and write it down.
- Keep the required fields few in each system, so people actually fill them in.
- Move data between systems automatically, without anyone retyping it.
- Report from one place that reads every system, so every leader works from the same numbers.
Go Fig builds this as Data and AI services on its own platform. A data foundation pulls each system’s data into one private place, pipelines keep it current, and reporting traces every number back to the system that owns it. Go Fig’s AI agents keep the CRM current from emails and calls, and each change waits for a person’s OK until your team decides to let it run on its own. See Data and AI services.