Enterprise architecture (EA) is one of those terms that means different things to different people. Stripped of jargon, it's simply the practice of making sure an organisation's business, information and technology fit together and support the strategy.
Enterprise architecture is the practice of describing how an organisation is put together — its capabilities, processes, information, applications and technology — so that change can be planned deliberately rather than accidentally.
That definition is deliberately mundane, because the discipline suffers from grand ones. EA is not "aligning IT with the business" in the abstract. It is the concrete work of making sure that when an organisation decides to do something, someone has thought about what it will break, what it duplicates, and what it commits you to for the next decade.
Stripped of the literature, the week-to-week work falls into a small number of recurring activities:
An architect who does the first two and none of the last three produces documents. An architect who does the last three without the first two makes arbitrary decisions. The value is in the combination.
Almost every genuine architecture request reduces to one of four questions:
If a piece of architecture work cannot be traced to one of those, it is worth asking who is waiting for it.
The distinction confuses newcomers and matters in practice. Enterprise architecture operates across the organisation and over years; its unit of work is the portfolio or the capability. Solution architecture operates within a programme and over months; its unit of work is a system being built or bought. Domain architecture — data, security, integration, infrastructure — provides depth in one layer across many solutions.
The relationship is straightforward: EA sets the constraints and the direction, solution architecture works within them, domain architects supply specialist judgement to both. Where it goes wrong is when enterprise architects try to review every design decision, or when solution architects treat enterprise constraints as advisory. See enterprise architect vs solution architect for a fuller comparison.
Architecture pays for itself in a small number of high-leverage situations: before large platform selections, during merger integration, when an application estate has grown past the point anyone can hold in their head, when regulation forces a structural answer, and whenever a business case depends on a claim about reuse or consolidation that nobody has verified.
It earns nothing when it is used to document decisions already made, to produce diagrams for their own sake, or as a review gate that no project can fail.
The failure modes are consistent enough to be predictable:
Useful signals are behavioural rather than documentary. Are architects invited to shape investment cases before the money is allocated, or asked to rubber-stamp afterwards? Can anyone name a decision that changed because of an architecture review? Do exceptions get raised openly, or do teams quietly build what they were going to build anyway? Are the same problems being rediscovered every eighteen months?
If you want to measure it more formally, architecture governance KPIs covers what to track and what to show leadership.
MethodVault packages these four core practices into complete, editable toolkits — assessment, rationalisation, review and governance — so you can run them without building the method from scratch.
