The Bridge Between Business and IT

Tags:

• Information Systems

Categories:

• Enterprise Architecture Management

Information System Architecture – The Bridge Between Business and IT

Information System Architecture (ISA) forms the central link between business requirements and technological implementation. It translates functional requirements from business architecture into concrete information systems while ensuring these can be operated efficiently on the IT infrastructure.

Within the context of Enterprise Architecture Management (EAM), it plays a key role: It connects business processes, data, and applications into a consistent overall picture of the IT landscape.

flowchart TD
id1(Business Architecture) <--What? How?--> id2(Information System Architecture) <--With What?--> id3(Technical Architecture)
style id1 fill:#ffffee,stroke:#eeeeee,stroke-width:2px
style id2 fill:#00ffff,stroke:#000000,stroke-width:2px
style id3 fill:#eeffee,stroke:#eeeeee,stroke-width:2px

What Exactly Does This Mean?

Information System Architecture describes the structure, relationships, and interactions of information systems within an organization.

It answers central questions such as:

• Which applications support which business processes?
• Where is which data processed?
• How do systems interact with each other?
• What dependencies exist?

EAM provides the methodological framework for this: It enables a holistic view of business and IT to master complexity and make well-founded decisions.

Objectives of Information System Architecture

• Create transparency over the IT landscape
• Ensure business-IT alignment
• Reduce redundancies and complexity
• Provide a foundation for strategic IT planning

A central problem for many organizations is a historically grown, heterogeneous system landscape with redundant functions and unmanageable interfaces.

How Can IS Architecture Be Subdivided?

Information System Architecture can be divided into several closely interconnected sub-areas:

flowchart LR  
A(Data / Information) --> B(Applications)  
B --> C(Integration)  
C --> A

Data/Information

Data architecture describes the functional and technical data structures of an organization.

Central Aspects:

• Business objects (e.g., customer, order)
• Data models and data flows
• Data quality and ownership
• Data protection and security requirements

Data is the foundation of information systems – without a consistent data basis, no stable architecture is possible.

Objective: “Single Source of Truth” and avoidance of redundancies

Applications

Application architecture describes the totality of information systems used and their functional assignment.

Typical Elements:

• Business applications (e.g., ERP, CRM)
• Services / Microservices
• Legacy systems
• Application landscape

A key objective is managing system diversity, as too many applications with similar functions lead to increasing complexity and costs.

Objective: Consolidation and clear responsibilities

Integration

Integration architecture describes how applications communicate with each other.

flowchart TD  
A(System A) -->|API| B(Integration Layer)  
B -->|Event| C(System B)  
B -->|Batch| D(System C)

Typical Integration Forms:

• APIs (REST, GraphQL)
• Messaging / Events
• ETL / Batch processing
• Middleware / ESB

Integration is one of the most critical aspects, as this is where the greatest complexity often arises (interface sprawl).

Objective: Loose coupling and standardized interfaces

Architecture Principles & Governance

In practice, Information System Architecture cannot be managed without clear guardrails.

Typical Principles:

• Standardization before customization
• Reuse before new development
• API-First / Service orientation
• Cloud-readiness

Governance Elements:

• Architecture reviews
• Target architectures and roadmaps
• Technology standards

EAM ensures these principles are systematically applied and controlled.

How Is the Connection to Business and IT Infrastructure Ensured?

Information System Architecture works in two directions:

1. Connection to Business

flowchart TD  
A(Business Process) --> B(Information System)  
B --> C(Data Objects)

• Business processes define requirements
• Information systems implement these
• Data forms the functional foundation

This allows analysis of questions such as:
“Which systems support which process?”

2. Connection to IT Infrastructure

flowchart TD
A(Information System) --> B(Platform)
B --> C(Infrastructure)

• Applications run on platforms
• Platforms use infrastructure (cloud, network, hardware)
• Technical architecture ensures operations

Central Mechanisms for Alignment

• Transparency through visualization (e.g., architecture blueprints)
• Linking business and IT objects
• Target architecture and roadmaps
• Continuous dependency analysis

EAM enables an integrated view of all architecture dimensions here and makes relationships visible.

Conclusion

Information System Architecture is far more than a technical discipline – it is the central control instrument for the IT landscape.

It:

• Connects business and IT
• Creates transparency and decision-making foundations
• Reduces complexity
• Enables strategic further development

Without a clear Information System Architecture, there is a risk of:

• Uncontrolled growth of the IT landscape
• Increasing costs and risks
• Lack of strategic controllability

With an established ISA, however, a viable bridge between business strategy and technological implementation is created – and thus the foundation for successful digital transformation.

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