A business needs software integration when staff re-key the same data into several systems, records disagree between applications, reports depend on manual spreadsheet exports, or each new tool needs its own custom connection. Software integration links separate applications so data and processes flow between them automatically, typically through APIs, middleware or an integration platform.
Key Takeaways
- Software integration (also called system integration) links separate applications so they work as a coordinated whole.
- The clearest warning signs are duplicate data entry, conflicting records across systems, and manual exports used to build reports.
- Point-to-point connections grow fast: fully connecting 10 applications directly takes 45 separate links.
- Common methods include point-to-point (star) integration, an enterprise service bus or hub, ETL pipelines, webhooks and cloud integration platforms (iPaaS).
- Run a cost-benefit analysis before starting, because integration has real costs and can add coupling between systems.
Most organizations now run many separate systems and applications, such as accounting, CRM, HR and inventory tools. For those systems to support efficient work, they usually need to share data with one another. In cases where your business has several disparate systems and applications, you would want to have a perfect system integration.
Before starting an integration project, it helps to confirm which specific problems integration would solve. The sections below describe the common warning signs.
What is System Integration?
System Integration or software integration is the process of linking different computing systems and software applications, physically or functionally, so they act as a coordinated whole. Information can then flow in one direction (unidirectional) or both directions (bidirectional) between the connected systems.
Integration does not usually merge the systems into one product. Each application keeps running, but it exchanges data with the others through APIs, middleware or an integration platform.
Integration can be complex, because the systems involved may run on different operating systems, use different databases or data formats, or be legacy products the original vendor no longer supports. A right software integration can improve workflows and reduce manual work.
Why do you need to undertake Software integration?
Several situations point to a need for software integration. An experienced software integration company can help assess the options, though many integrations can also be built in-house or with off-the-shelf connectors.
The most common situations that call for software integration are described below.
1) Existence of different information systems
An organisation can have different information systems. When those systems cannot communicate, identical data ends up stored in several places and simple processes cannot be automated. Integration lets the platforms share data so each record is entered once and kept consistent.
2) Need for multiple functionality
A single business process often depends on several applications or modules. Connecting those modules lets the process run end to end without manual hand-offs.
Consider the case of recruitment and HR department of your organisation which may have different modules of information systems for recruitment, attendance, and payroll. Integrating them means a new hire entered once in the recruitment system can flow automatically into attendance and payroll.
Ideally speaking, every situation that incorporates complex domains and systems like finance, banking and several such options, software integration can reduce manual reconciliation between systems.
Moving data between unconnected systems by hand introduces the risk of human error. Integration reduces manual data entry, which also helps reduce those errors.
If employees enter the same data into multiple systems, their time goes into repetitive work instead of more valuable tasks. Integration removes much of that duplicate entry.
Another common trigger is running applications from several different vendors that were never designed to work together. An internal IT team, a systems integrator or an outside developer can build the connections between them.
Software integration is rarely simple. Connecting a firm’s IT infrastructure takes planning, and the choice of integration method and data-movement approach has long-term cost consequences.
Compare the integration methods below and choose the one that fits the number of systems involved, the data volumes and the in-house skills available.
Signs Your Business Needs Software Integration
The following warning signs, taken together, usually indicate that separate systems have become a bottleneck:
- Duplicate data entry: staff type the same customer, order or employee details into two or more applications.
- Conflicting records: a customer address or stock level differs between the CRM, the accounting system and the warehouse system.
- Spreadsheet workarounds: reports are built by exporting files from several tools and combining them by hand.
- Slow processes: an order, approval or onboarding step waits for someone to copy information from one screen to another.
- Information silos: teams cannot see data held by another department’s system.
- Connection sprawl: every new tool needs its own custom link to every other tool, and nobody has a full map of those links.
Business software such as supply chain management, ERP, CRM, business intelligence, payroll and HR systems often cannot share data or business rules with each other. Such applications are sometimes called islands of automation or information silos, and the result is identical data stored in multiple locations and processes that cannot be automated.
Why Point-to-Point Connections Become a Problem
Point-to-point integration connects each system directly to each other system that needs its data. This approach is also called star or spaghetti integration, because the full diagram of connections looks like a plate of spaghetti.
The number of links needed for a full point-to-point mesh is n(n-1)/2, where n is the number of applications. Fully connecting 10 applications this way requires 10 x 9 / 2 = 45 separate connections.
| Applications | Point-to-point links (full mesh) | Links to a central hub or bus |
|---|---|---|
| 3 | 3 | 3 |
| 5 | 10 | 5 |
| 10 | 45 | 10 |
| 20 | 190 | 20 |
In practice, not every system needs to talk to every other system, so real organizations usually have fewer links than the full-mesh figure. Even so, when the count of custom connections keeps rising with each new tool, a central integration layer is worth considering. For older systems, see this overview of legacy system integration and API transformation providers.
Main Methods of Software Integration
Software integration methods differ in how systems are connected and how much central infrastructure they require.
| Method | How it works | Best suited to | Main drawback |
|---|---|---|---|
| Point-to-point (star) | Each system connects directly to the others it needs. | A small number of systems | Connections and cost rise quickly as systems are added |
| Vertical (silo) integration | Subsystems are grouped by function into separate silos. | Quick, short-term projects with few vendors | Higher long-term cost; adding a function means building another silo |
| Horizontal integration / enterprise service bus (ESB) | A dedicated subsystem handles communication, so each system needs only one connection, to the bus. | Many systems that change over time | Data transformation and business-logic costs do not disappear |
| ETL (extract, transform, load) | Data is extracted from sources, cleaned and transformed, then loaded into a target such as a data warehouse. | Reporting and analytics | Often run in scheduled batches, although real-time streaming is also used |
| Webhooks | One application sends an HTTP request to a configured URL when an event happens. | Event-driven updates between web applications | Incoming requests must be authenticated to prevent spoofing |
| Integration platform as a service (iPaaS) | Cloud services used to build, run and govern integration flows without installing hardware or middleware. | Connecting SaaS tools, increasingly also on-premises systems | Ongoing subscription costs and reliance on a provider |
What is an enterprise service bus?
An enterprise service bus (ESB) is software that sits between business applications and routes messages between them, translating each message into a format the receiving application can read. With an ESB, one subsystem can be replaced by another with a different interface, and only the connection between the bus and the new subsystem has to be built.
What is ETL?
ETL (extract, transform, load) is a three-phase process that pulls data from one or more sources, cleans and transforms it, and loads it into a target such as a data warehouse, data mart or data lake. A cost accounting system that combines data from payroll, sales and purchasing is a typical ETL use. Read more about ETL migration and how data integration adds value to a business.
What are webhooks?
Webhooks are user-defined HTTP callbacks: when an event occurs, such as a purchase or a code push, the source application sends an HTTP request to a URL the user configured. The term was coined by Jeff Lindsay in 2007. Services including GitHub and Stripe sign webhook requests with an HMAC signature so the receiver can verify them. Because integrations expose data through APIs and endpoints, review common API security threats before connecting systems.
How to Assess Whether to Integrate: Step by Step
- List every system the business uses, who owns it and what data it holds.
- Map data flows: note where the same data is entered twice, exported or copied by hand.
- Measure the manual effort those hand-offs take each week and the errors they cause.
- Check what each system supports: available APIs, built-in connectors, file exports and webhooks.
- Choose a method that matches the number of systems: direct connections for two or three, a hub, bus or iPaaS for many.
- Run a cost-benefit analysis comparing build and running costs with the time and errors saved.
- Start with one high-value flow, such as sales orders into accounting, then expand.
Benefits and Challenges of Software Integration
System integration can enable real-time data sharing for out-of-date legacy systems, reduce manual data entry (and the errors that come with it), modernize an application’s front end, and move querying and reporting off expensive operational systems onto cheaper ones. A common example is a WooCommerce CRM integration that sends online orders straight into customer records.
Integration also has known challenges. These include reluctance to share data with other companies, unclear responsibilities, disagreement over where functionality should sit, high integration costs, difficulty finding skilled staff, data silos and the lack of common API standards. Enterprise application integration can also increase coupling between systems, which raises management overhead, so a cost-benefit analysis is usually done before an integration project begins.
Frequently Asked Questions
What is software integration in simple terms?
Software integration is the process of connecting separate applications so they share data and work together as one coordinated system. For example, an online store can send each new order automatically to the accounting and shipping systems instead of someone retyping it.
What is the difference between system integration and software integration?
System integration is the broader term: in engineering it means combining subsystems into one working system, and in IT it means linking computing systems and software applications. Software integration usually refers to the application-to-application part of that work, and the two terms are often used interchangeably.
How many connections does point-to-point integration need?
A full point-to-point mesh needs n(n-1)/2 connections for n applications, so 10 applications need 45 links. With a central bus or hub, each application needs only one connection, to the hub.
What is iPaaS?
iPaaS (integration platform as a service) is a set of cloud services for developing, running and governing integration flows between applications. Users do not install or manage the hardware or middleware themselves, and hybrid iPaaS can connect cloud applications to on-premises systems.
Does every small business need software integration?
No. A business running two or three tools with little shared data may manage well with built-in connectors or occasional exports. Integration becomes worthwhile when duplicate entry, conflicting records or manual reporting cost more time than the integration would cost to build and maintain.
