EA as a method for change

9 important questions on EA as a method for change

What are examples of external drivers for using EA?

Legislation, standardizaiton, or supervisory institutions

How to choose the right 'to-be' architecture?


The picture approach implements the Analytical hierarchy Planning to decide on the right 'to-be architecture'. This approach calculates the best choice by indicating certain weight factors to system characteristics and performing a sensitivity analysis.


It helps in the decision support for information management. It does this by using a Comparison Matrix.

What are two other PWC tools to reduce EA complexity?

  1. Mapping applications (systems) to business processes (PWC): This model supports analysis of the application portfolio to support management decisions. This leads to a project portfolio. In the end chaging the application portfolio.
  2. IS Application Portfolio Management: this method tries to map systems to processes what results in the binding of applications to certain processes. As a result redundant applications easily become visible what leads to reduced complexity.
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How can complexity of IS Application Portfolio be reduced?

  • Reduce Objective complexity (components, interfaces, functions)
    • Reduce #compnents per system & portfolio
    • Reduce #interfaces between systems
    • Reduce #functions
  • Reduce Subjective Complexity
    • Reduce the effort to understand the portfolio
    • Support decision making using AHP, distinguishing criteria, weights and objectives.

What are various other internal drivers for enterprise architecture implementation?

  • Auditing
  • Specify Managmenet information
  • Manage IT system portfolio
  • Manage (out)sourcing relationships
  • Guide systems development
  • Preparing a Merger or Axquisition
  • Reducing complexity

Name the four different types of commandments:

  • Enterprise priorities
  • Strategic systems per domain
  • Domain roadmap
  • Business objectives driven

What does the ANSI/IEEE say about Design Principles?

According to the ANSI/IEEE, Design Principles are used to govern architecture design and evolution. Principles should be used to limit desing space and guide design decisions. They should concern architecture design decision points so as to harmonize IT projects towards predefined goals.

What do expert opinions say about EA Principles?

Most of the experts strongly emphasize that EA Princples shoudl be understandable by key stakeholders. Having the support of the organization's key members and a set of complentary documents to make principels understandable for potential stakeholder's guarantees princples' intended influence on architecture, budgeting and project proposal decisions.

What do Haki and Legner say about EA Princples?


They state that good princples, based on their guidelines, which can be measured, which fit the architecture, then the quality of EA will increase, which results in EA benefits.


Moreover, it suggests investigating the use of princples and the detailed mechanisms to turn princples into Enterprise Architecture capabilities and benefits.

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