Why Systems Do Not Talk to Each Other
Most businesses gather their tools one at a time, each chosen for a good reason. Each works on its own, and people become the connection between them, copying details from one to the next. Connecting systems replaces that copying with direct links, so information is entered once and flows where it is needed.
The Ways Systems Can Be Connected
- A documented interface (an API): the most reliable option when a system offers one
- Event notifications: a system announces something the moment it happens
- Messages: many systems send notifications that can be read and acted on
- Files: scheduled exports and imports where nothing better exists
- Shared sheets: a simple, visible place for information to meet
Before choosing, check what each system supports. The method affects how quickly information moves and how often someone needs to check it. A simple, well-supported method usually beats a clever one.
Agreeing What the Data Means
The hardest part of connecting systems is rarely technology. It is agreeing what the information means. One system stores a full name, another splits it. One records amounts with tax, another without. Phone numbers appear in several formats. Write down, for each piece of information, where it comes from, what it looks like and where it goes. This mapping is dull, and you can't skip it. Most connection errors come from people who did.
One Source of Truth
When the same information lives in two places, one must win when they disagree. Decide, for each kind of information, which system holds the master copy. Connections should copy from the master outward, not in both directions, unless you are prepared for the complexity of two-way syncing.
What Breaks Connections
- A system changes how it works or how it is accessed
- Passwords or access keys expire
- Someone renames a column, a folder or a field
- Information arrives in a form nobody expected
- One system is unavailable when another tries to reach it
None of these can be fully prevented, so a good connection notices them. If a system is down, it tries again for a short while. Anything it can't make sense of is set aside, never dropped. If failures keep coming, it tells a person.
Access for Each Connection
Every connection uses some form of access. Give each one its own, with only the permissions it needs. Don't share one administrator login. Keep a list of which connection uses which access, so any one can be changed or withdrawn without breaking the rest.
You create least-privilege accounts for us, and you can revoke our access at any time.
Keeping a Register
Connections accumulate. Keep a simple register of what each one does, which systems it touches, who owns it and how to switch it off. It takes minutes to maintain and saves days when something changes or a member of staff leaves.
Mapping How Information Moves Today
Before connecting anything, draw how information currently moves between tools and people. Note where it is typed in, where it is copied and where it waits for someone to pass it on. The drawing usually shows a handful of points where most of the effort and most of the errors occur.
Focus connections on those points. Linking every system to every other system is rarely necessary and adds maintenance for little benefit. A few well-chosen connections often remove most of the copying in a business.
One Source of Truth for Each Kind of Information
When the same information lives in several places, the copies drift apart. Decide which system holds the master version of each kind of information, and let the others read from it. Updates then happen in one place and flow outwards.
This decision is organisational as much as technical. Staff need to know where to make changes, and old habits of updating spreadsheets on the side need to stop. Clear agreement on the master record prevents most of the confusion that connections can otherwise create.
Handling Failures Between Systems
Connections fail from time to time: a system is down for maintenance, a password expires or a format changes. A reliable connection notices the failure, retries sensibly and tells someone if the problem persists. It never quietly drops information.
Plan for duplicates as well as gaps. When a connection retries, the same record may arrive twice. Designing each step so that repeating it does no harm keeps the data clean even when the connection is unreliable.
Security at the Joins
Every connection needs credentials, and every credential is a possible weak point. Use a separate account for each connection, with only the permissions it needs, and store its credentials securely. When a connection is retired, remove its access straight away.
Keep a simple list of all connections, what they access and who owns them. That list makes reviews quick and helps new staff understand how the business's systems fit together. It also makes it obvious when an old connection has been forgotten.