Software Architecture Guide

When people in the software industry talk about “architecture”, they refer to a hazily defined notion of the most important aspects of the internal design of a software system. A good architecture is important, otherwise it becomes slower and more expensive to add new capabilities in the future.

Like many in the software world, I’ve long been wary of the term “architecture” as it often suggests a separation from programming and an unhealthy dose of pomposity. But I resolve my concern by emphasizing that good architecture is something that supports its own evolution, and is deeply intertwined with programming. Most of my career has revolved about the questions of what good architecture looks like, how teams can create it, and how best to cultivate architectural thinking in our development organizations. This page outlines my view of software architecture and points you to more material about architecture on this site.

A guide to material on martinfowler.com about software architecture.

What is architecture?

People in the software world have long argued about a definition of architecture. For some it's something like the fundamental organization of a system, or the way the highest level components are wired together. My thinking on this was shaped by an email exchange with Ralph Johnson, who questioned this phrasing, arguing that there was no objective way to define what was fundamental, or high level and that a better view of architecture was the shared understanding that the expert developers have of the system design.

Ralph Johnson, speaking at QCon

A second common style of definition for architecture is that it it's “the design decisions that need to be made early in a project”, but Ralph complained about this too, saying that it was more like the decisions you wish you could get right early in a project.

His conclusion was that “Architecture is about the important stuff. Whatever that is”. On first blush, that sounds trite, but I find it carries a lot of richness. It means that the heart of thinking architecturally about software is to decide what is important, (i.e. what is architectural), and then expend energy on keeping those architectural elements in good condition. For a developer to become an architect, they need to be able to recognize what elements are important, recognizing what elements are likely to result in serious problems should they not be controlled.

Ralph's email formed the core of my column for IEEE software, which discussed the meaning of software architecture and the role of an architect.

Why does architecture matter?

Architecture is a tricky subject for the customers and users of software products - as it isn't something they immediately perceive. But a poor architecture is a major contributor to the growth of cruft - elements of the software that impede the ability of developers to understand the software. Software that contains a lot of cruft is much harder to modify, leading to features that arrive more slowly and with more defects.

This situation is counter to our usual experience. We are used to something that is "high quality" as something that costs more. For some aspects of softare, such as the user-experience, this can be true. But when it comes to the architecture, and other aspects of internal quality, this relationship is reversed. High internal quality leads to faster delivery of new features, because there is less cruft to get in the way.

While it is true that we can sacrifice quality for faster delivery in the short term, before the build up of cruft has an impact, people underestimate how quickly the cruft leads to an overall slower delivery. While this isn't something that can be objectively measures, experienced developers reckon that attention to internal quality pays off in weeks not months.

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At OSCON in 2015 I gave a brief talk (14 min) on what architecture is and why it matters.


Application Architecture

The important decisions in software development vary with the scale of the context that we're thinking about. A common scale is that of an application, hence "application architecture".

The first problem with defining application architecture is that there's no clear definition of what an application is. My view is that applications are a social construction:

Such a loose definition leads to many potential sizes of an application, varying from a few to a few hundred people on the development team. (You'll notice I look at size as the amount of people involved, which I feel is the most useful way of measuring such things.) The key difference between this and enterprise architecture is that there is a significant degree degree of unified purpose around the social construction.

Application Boundary

One of the undecided problems of software development is deciding what the boundaries of a piece of software is. (Is a browser part of an operating system or not?) Many proponents of Service Oriented Architecture believe that applications are going away - thus future enterprise software development will be about assembling services together.

I don't think applications are going away for the same reasons why application boundaries are so hard to draw. Essentially applications are social constructions:

Microservices Guide

The microservice architectural pattern is an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API. These services are built around business capabilities and independently deployable by fully automated deployment machinery. There is a bare minimum of centralized management of these services, which may be written in different programming languages and use different data storage technologies. While their advantages have made them very fashionable in the last few years, they come with the costs of increasing distribution, weakened consistency and require maturity in operational management.

Serverless Architectures

Serverless architectures are application designs that incorporate third-party “Backend as a Service” (BaaS) services, and/or that include custom code run in managed, ephemeral containers on a “Functions as a Service” (FaaS) platform. By using these ideas, and related ones like single-page applications, such architectures remove much of the need for a traditional always-on server component. Serverless architectures may benefit from significantly reduced operational cost, complexity, and engineering lead time, at a cost of increased reliance on vendor dependencies and comparatively immature supporting services.

by Mike Roberts

22 May 2018

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application architecture

Micro Frontends

Good frontend development is hard. Scaling frontend development so that many teams can work simultaneously on a large and complex product is even harder. In this article we'll describe a recent trend of breaking up frontend monoliths into many smaller, more manageable pieces, and how this architecture can increase the effectiveness and efficiency of teams working on frontend code. As well as talking about the various benefits and costs, we'll cover some of the implementation options that are available, and we'll dive deep into a full example application that demonstrates the technique.

by Cam Jackson

19 Jun 2019

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application architecture front-end microservices

GUI Architectures

In the mid 2000s I was pursuing a couple writing projects that could have turned into books, but haven't yet made it. One was on the architecture of user interfaces. As part of this work, I drafted a description of how GUI architectures evolved, comparing the default approach of Forms and Controls with the the Model-View-Controller (MVC) pattern. MVC is one of the most ill-understood patterns in the software world, understandably so since it was not well documented. So my writing here tries to give a better picture of what MVC really means and how it evolved through Model-View-Presenter and other forms.

Presentation Domain Data Layering

One of the most common ways to modularize an information-rich program is to separate it into three broad layers: presentation (UI), domain logic (aka business logic), and data access. So you often see web applications divided into a web layer that knows about handling HTTP requests and rendering HTML, a business logic layer that contains validations and calculations, and a data access layer that sorts out how to manage persistent data in a database or remote services.


Enterprise Architecture

While application architecture concentrates on the architecture within some form of notional application boundary, enterprise architecture looks architecture across a large enterprise. Such an organization is usually too large to group all its software in any kind of cohesive grouping, thus requiring coordination across teams with many codebases, that have developed in isolation from each other, with funding and users that operate independently of each other.

Much of enterprise architecture is about understanding what is worth the costs of central coordination, and what form that coordination should take. At one extreme is a central architecture group that must approve all architectural decision for every software system in the enterprise. Such groups slow down decision making and cannot truly understand the issues across such a wide portfolio of systems, leading to poor decision-making. But the other extreme is no coordination at all, leading to teams duplicating effort, inability for different system to inter-operate, and a lack of skills development and cross-learning between teams.

Like most people with an agile mindset, I prefer to err on the side of decentralization, so will head closer to the rocks of chaos rather than suffocating control. But being on that side of the channel still means we have to avoid the rocks, and a way to maximize local decision making in a way that minimizes the real costs involved.

Enterprise Architects Join the Team

Enterprise Architecture groups often get separated from day to day development. This can lead to their knowledge of development work getting out of date and development teams not taking a broad company-wide perspective. Having seen this happen frequently my colleague (ThoughtWorks CTO) Rebecca argues that enterprise architects can be much more effective by joining development teams.

by Rebecca Parsons

1 Sep 2005

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ieeeSoftware enterprise architecture

The Role of an Enterprise Architect in a Lean Enterprise

When an organization takes on an agile mindset, enterprise architecture doesn't go away, but the role of enterprise architects changes. Enterprise Architects no longer make choices, but help others make the right choice and then radiate that information. Enterprise Architects still need to form a vision, but then need to build bridges between teams to build communities of learning. These will allow teams to explore new approaches and learn from each other, with Enterprise Architects as partners in that growth.

by Kevin Hickey

30 Nov 2015

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agile enterprise architecture technical leadership

Products Over Projects

Software projects are a popular way of funding and organizing software development. They organize work into temporary, build-only teams and are funded with specific benefits projected in a business case. Product-mode instead uses durable, ideate-build-run teams working on a persistent business issue. Product-mode allows teams to reorient quickly, reduces their end-to-end cycle time, and allows validation of actual benefits by using short-cycle iterations while maintaining the architectural integrity of their software to preserve their long-term effectiveness.

by Sriram Narayan

20 Feb 2018

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enterprise architecture team organization

The Architect Elevator — Visiting the upper floors

Many large organizations see their IT engine separated by many floors from the executive penthouse, which also separates business and digital strategy from the vital work of carrying it out. The primary role of an architect is to ride the elevators between the penthouse and engine room, stopping wherever is needed to support these digital efforts: automating software manufacturing, minimizing up-front decision making, and influencing the organization alongside technology evolution.

by Gregor Hohpe

24 May 2017

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enterprise architecture