You can get from disconnected systems to a single source of truth without replacing everything. Keep the tools that do their job well, connect them so information is entered once and flows to where it's needed, and decide which system "owns" each type of information, such as customers, jobs, stock or hours. Start with the handoff that causes the most rekeying and errors, prove it works, then do the next one. The result is one set of numbers everyone trusts.
For example, a growing business might keep its accounts in Xero or MYOB, timesheets in an app or on paper, quotes in a spreadsheet, jobs in another system and documents across email and shared drives. None of them talk to each other.
The result is predictable. Information gets retyped between systems. Numbers don't match because someone entered them differently in two places. Reports take days to put together because the figures have to be pulled from several places and reconciled by hand. By the time the picture comes together, it is already out of date.
You don't need to replace everything
The most common misunderstanding is that fixing this needs one big new system that replaces everything at once. Usually it doesn't. In most cases the individual tools are fine. Xero is good at accounting. A good timesheet app is good at timesheets. The problem is the gaps between them.
Connecting your systems closes those gaps. When the timesheet system sends hours straight to your accounts, the same entry that pays staff also updates job costs. When your purchase orders are linked to your accounts, matching supplier bills to orders happens automatically instead of by hand.
There are times when replacing a system is the right call, for example when it's out of support or can't be connected to anything. But that should be a decision made for a clear reason, not the default answer.
Decide which system owns what
Connecting systems only helps if everyone agrees where each piece of information lives. Before you connect anything, decide:
- Customers and suppliers: usually owned by the accounting system or the CRM, but not both.
- Jobs or projects: owned by your job or project system, with costs flowing to the accounts.
- Products and stock: owned by the inventory system, with values flowing to the accounts.
- Hours worked: owned by the timesheet system, sent to payroll and job costing.
Each type of information is created and changed in one place, and every other system receives a copy. When two systems disagree, you know which one is right. This is what people mean by a single source of truth: not one giant system, but a clear rule about where each fact lives. Our plain-English guide to a single source of truth goes into this in more detail.
The step-by-step approach
- Map how information moves today. Write down every place someone copies information from one system to another, including spreadsheets and paper. These are the places to connect. A business process map makes this much easier to see.
- Rank them by pain and frequency. Which manual handoff causes the most errors? Which happens most often? Start there.
- Use existing connectors where they fit. Built-in integrations between platforms, or tools like Zapier and Make, can connect many common business systems without custom work. Custom integration is for when the ready-made options don't do what your process needs.
- Start with one connection. Prove it works before expanding. Timesheets to accounts, or purchase orders to supplier bills, are common first choices.
- Then build reporting on top. Once information flows reliably, a dashboard that pulls from your connected systems becomes far easier to build and trust.
The goal is that nobody notices
The best integration is the one you forget exists. When timesheets flow into payroll and job costing without anyone thinking about it, when purchase orders match to invoices on their own, when the management report updates itself every morning, that's when it's working. The goal is not impressive technology. It's removing the manual work that slows you down and causes errors.
Frequently asked questions
What does "single source of truth" actually mean?
It means each piece of information, such as a customer's details or a job's budget, is kept and changed in one place, and every other system gets its copy from there. Everyone sees the same numbers, and there's no debate about which spreadsheet is right.
Do we need an ERP system to get there?
Not necessarily. Many businesses get there by connecting the systems they already have. A larger system can make sense when you've genuinely outgrown your tools, but it isn't the only route.
Is Zapier enough, or do we need custom integration?
Zapier and similar tools handle many simple, common connections well. Custom integration is worth it when the volume is high, the rules are complicated, or the systems involved aren't supported by ready-made tools.
Where should we start?
With the manual handoff that causes the most errors or takes the most time. Fix that one properly before moving on.
If you'd like help working out which connections would make the biggest difference, book a free initial chat.