I am an author, speaker, and loud-mouth on the design of enterprise software. I work for ThoughtWorks, a software delivery and consulting company. This site contains lots of my writing on software development, which primarily focuses on software design and agile methods. To find your way around this site, go to the intro guide.


News and Updates

My atom feed (RSS) announces any updates to this site, as well as various news about my activities and other things I think you may be interested in. I also make regular announcements via my twitter feed, which I copy to my facebook page.


photostream 63

Fri 04 Apr 2014 17:59 EDT

Heronswood, Mornington Peninsula, Victoria, Australia


Bliki: ReportingDatabase

Wed 02 Apr 2014 14:23 EDT

Most EnterpriseApplications store persistent data with a database. This database supports operational updates of the application's state, and also various reports used for decision support and analysis. The operational needs and the reporting needs are, however, often quite different - with different requirements from a schema and different data access patterns. When this happens it's often a wise idea to separate the reporting needs into a reporting database, which takes a copy of the essential operational data but represents it in a different schema.

more ...


Open-Sourcing ThoughtWorks Go

Tue 25 Mar 2014 10:52 EDT

ThoughtWorks recently announced the open-sourcing of our product Go - which supports Continuous Delivery. This kind of event tends to raise questions, so I organized an interview with Chad Wathington, who is a Managing Director of ThoughtWorks Studios (our product division). He answers questions on why we did the open-sourcing, why we announced it before making the source available, about the name-clash with the go language, and our future plans for Go.


Are Microservices the Future?

Tue 25 Mar 2014 09:37 EDT

The final installment of our article on microservices moves beyond the list of characteristics to assess the question of whether microservices should be the future of enterprise application architecture.


Microservices: Evolutionary Design

Mon 24 Mar 2014 10:17 EDT

The penultimate installment of our article on microservices looks at the last of the list of common characteristics: an evolutionary approach to the design of microservice systems.


Bliki: EnterpriseApplication

Mon 24 Mar 2014 10:15 EDT

In the early part of this century, I worked on my book Patterns of Enterprise Application Architecture. One of the problems I had when writing the book was how to title it, or rather what to call the kinds of software systems that I was writing about. I've always been conscious that my experience of software development has always been focused on one particular form of software - things like health care records, foreign exchange trading, payroll, and lease accounting. These are very different to embedded software inside printers, games, flight control software, or telephone switches. I needed a name to describe these kinds of systems and settled on the term "enterprise application".

more ...


photostream 62

Sat 22 Mar 2014 13:43 EDT

Casa Batlló, Barcelona



Continuous Integration and Delivery

For a long time I’ve been a champion of Continuous Integration which reduces integration risk by integrating early and often, an application of the principle of Frequency Reduces Difficulty. We’ve found CI to be a core technique at ThoughtWorks and use it almost all the time. At the heart of this is a style of development that minimizes long feature branches with techniques like Branch By Abstraction and Feature Toggles.

While this is useful, there was still risk present from software that works in the development environment to getting it to work in production. As a result we developed Deployment Pipelines to reduce this risk, moving closer to our aim of Continuous Delivery: building software in such a way that we confidently deploy the latest builds into production whenever there is a business need. We find this improves feedback, reduces risk, and increases the visibility of project progress.

For more information: take a look at my guide page on Continuous Delivery.


NoSQL Databases

I’ve been involved in enterprise software for two decades and while we’ve seen huge technological change during that time, the relational database has been a constant figure. Previous attempts to dethrone relational databases have failed, but some people think the new rise of NoSQL databases will finally consign relational databases to history. While I think relational databases are going to an important part of the landscape for a long time, I do think that there is a big change coming in the database field.

I’ve been collaborating with my colleague Pramod Sadalage, on exploring and explaining this shift. For more information take a look at the nosql guide.


TW logo

I discovered ThoughtWorks in 2000: then a small American company whose philosphy of software development was remarkably similar to my own. Now we’ve grown to around 2500 people world-wide, but kept the values that make us special. My colleagues have built critical systems for many clients in that time, and I’ve learned many lessons from them. While doing this, we found we often didn’t have the tools we needed, so we started to build them. This led to open-source tools such as CruiseControl, Selenium, Frank, and Moco as well as commercial products.

I have many opportunities, but I’ve stayed at ThoughtWorks because of the quality of my colleagues, who include both well-known speakers and those who may not be famous names but do an excellent job of software delivery (and feed me the information to write about). We are inspired by working with each other and our unusual three-pillar philosophy that raises professional excellence and social justice to the same level as financial performance.

And we are always looking for more great people to join our curious company. Maybe I’ll see you in one of our offices some day.


An Appropriate Use of Metrics

As with any style of process, agile software development has bred lots of interest in metrics. The thinking goes something like this, “We need a number to measure how we’re doing. Numbers focus people and help us measure success.” Whilst well intentioned, management by numbers unintuitively leads to problematic behavior and ultimately detracts from broader project and organizational goals. Metrics inherently aren’t a bad thing; just often, inappropriately used. Pat Kua, author of The Retrospective Handbook, demonstrates these issues and offers an alternative approach that uses metrics well.



Upcoming Talks
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17–18Agile Australia: Melbourne


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