Enterprise Architecture Design
Design of target enterprise architecture — business, application, data, and technology layers — aligned with your strategic direction and transformation programme.
Understanding This Service
What It Is
A comprehensive enterprise architecture design programme covering all four TOGAF architecture layers — business, application, data, and technology — to produce a coherent target architecture model that guides your transformation programme and IT investment decisions.
Who It's For
CIOs, enterprise architects, and transformation programme boards in large enterprises and public administrations embarking on significant digital transformation, ERP modernisation, or IT strategy programmes requiring a formal EA foundation.
When It's Needed
At the outset of a major transformation programme, when the existing enterprise architecture is outdated or absent, during mergers requiring IT landscape integration, or when IT investment decisions lack an architecture reference to guide them.
Why Clients Request This Service
No Target Architecture Reference
Transformation Without Architecture Direction
IT Investment Decisions Misaligned
Architecture Governance Gap
Scope of Testing
Scope is tailored per programme, but most EA design engagements draw from the following.
Business Architecture
Design of the business architecture layer — capabilities, value streams, organisational structures, and business process alignment.
Application Architecture
Design of the application architecture layer — target application portfolio, system interactions, and rationalisation direction.
Data Architecture
Design of the data architecture layer — data domains, information flows, master data management, and data governance principles.
Technology Architecture
Design of the technology architecture layer — infrastructure platforms, cloud strategy, integration patterns, and technology standards.
Architecture Principles & Governance
Definition of architecture principles, decision criteria, and governance processes to guide consistent architecture decision-making.
How We Run This Engagement
Architecture Vision
Define the architecture vision, stakeholder requirements, and scope aligned to the TOGAF Architecture Development Method (ADM) Phase A.
Business Architecture Design
Design the business architecture — capabilities, value streams, and process alignment — as the foundation for all subsequent architecture layers.
Application & Data Architecture Design
Design the application and data architecture layers, aligned to the business architecture and transformation programme requirements.
Technology Architecture Design
Design the technology architecture layer including platforms, cloud strategy, integration, and infrastructure standards.
Transition Planning & Governance
Develop the transformation roadmap, architecture migration plan, and governance framework to guide implementation.
What You Walk Away With
Enterprise Architecture Model
A comprehensive ArchiMate-based enterprise architecture model covering all four TOGAF layers, delivered in an agreed architecture modelling tool.
Architecture Principles
A documented set of architecture principles providing the decision criteria for consistent architecture governance across the enterprise.
Transformation Roadmap
A phased transformation roadmap aligned to the target architecture, sequencing initiatives by business value and architectural dependency.
Architecture Governance Framework
A governance framework covering architecture review processes, decision rights, and compliance mechanisms for maintaining architecture integrity.
Gap Analysis
Structured gap analysis between current and target architecture across all four layers, with prioritised transition actions.
This service commonly supports requirements under:
What Makes Our Testing Different
Enterprise Architecture Design establishes the architecture foundation that every major transformation programme depends on. Portamus applies TOGAF® and ArchiMate to design all four architecture layers — business, application, data, and technology — producing a coherent target architecture model, a set of governing principles, and a transformation roadmap that connects architecture decisions directly to investment priorities.
Questions About Enterprise Architecture Design
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