The Four Stages of Enterprise Architecture
An exclusive MIT survey maps the evolution of IT architecture and explains why you can't skip any steps.
Business Modularity
Very few enterprises are at Stage 4. They account for just 6 percent of the roughly 450 companies CISR surveyed.
Still, CIOs in the latter part of Stage 3 can already see how Stage 4 might look. At Celanese, CIO Wachs says parts of his organization are in Stage 4, focusing on modular processes that can be easily managed within an enterprisewide architecture. "Companies can be agile only if they can turn specific functions on and off," Wachs asserts, and that requires understanding what the functions are, where they are used and what they affect. That in turn requires having an architecture designed for both flexibility and consistency, he says.
State Street also believes it is in the beginning of Stage 4, says Saul. "We know we’ll have to get the IT people better at understanding business processes and at communication," he says. "The lines between IT and business are blurring," he continues, "and it’s clear that someone will have to manage both." For some companies, that means IT may become part of a shared-services effort. (For more on the role the CIO will play in this type of organizational structure, see "EA Changes Everything.")
Less clear is what a mature Stage 4 organization will be, what it will look like, says MeadWestvaco’s McGrane. "The understanding of how to use IT for agility and game-changing things versus incremental improvements is just starting," he notes. And he’s not sure the enabling technologies are really there yet. One thing McGrane is sure of: "You can’t move to Stage 4 until the entire enterprise has achieved Stage 3, because Stage 3 sets up the process orientation necessary to view the enterprise as modules, as Stage 4 requires."
A Journey, Not a Place
While it’s tempting to think of each stage as a place to arrive at, a truer way to see it is as a transformative process with the enterprise gradually transitioning from one stage to another, CISR’s Ross says. That’s because the volume of change is immense, and more important, people must change along with the technology. (For more on managing change, see "The New Science of Change.") That’s why CIOs should promote incremental deployments and promise incremental value, both to ease the impact of change and to nurture management’s enthusiasm for the effort, says Celanese’s Wachs.
In fact, because of the legacy of mergers, different levels of business need and buy-in, or external forces such as regulation, companies often find that they’re in different stages simultaneously. For example, at Celanese, the HR system is still in Stage 2 because of payroll requirements, while other parts of the company are entering Stage 4, says Wachs.



