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This Isn t Real We don t know if this is exactly the order of steps we ll take, but we believe we need all of this, and we can adjust as we go along To keep ourselves focused, we ve written the plan on an index card, as in Figure 94
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This Isn t Real
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By now you may be raising objections about all the practicalities we ve skipped over We saw them too We ve taken shortcuts with the process and design to give you a feel of how a real project works while remaining within the limits of a book In particular: This isn t a realistic architecture: XMPP is neither reliable nor secure, and so is unsuitable for transactions Ensuring any of those qualities is outside our scope That said, the fundamental techniques that we describe still apply whatever the underlying architecture may be (In our defense, we see that major systems have been built on a protocol as inappropriate as HTTP, so perhaps we re not as unrealistic as we fear) This isn t Agile Planning: We rushed through the planning of the project to produce a single to-do list In a real project, we d likely have a view of the whole deliverable (a release plan) before jumping in There are good descriptions of how to do agile planning in other books, such as [Shore07] and [Cohn05] This isn t realistic usability design: Good user experience design investigates what the end user is really trying to achieve and uses that to create a consistent experience The User Experience community has been engaging with the Agile Development community for some time on how to do this iteratively This project is simple enough that we can draft a vision of what we want to achieve and work towards it
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10
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The Walking Skeleton
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In which we set up our development environment and write our rst end-to-end test We make some infrastructure choices that allow us to get started, and construct a build We re surprised, yet again, at how much effort this takes
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So now we ve got an idea of what to build, can we get on with it and write our rst unit test Not yet Our rst task is to create the walking skeleton we described in First, Test a Walking Skeleton (page 32) Again, the point of the walking skeleton is to help us understand the requirements well enough to propose and validate a broadbrush system structure We can always change our minds later, when we learn more, but it s important to start with something that maps out the landscape of our solution Also, it s very important to be able to assess the approach we ve chosen and to test our decisions so we can make changes with con dence later For most projects, developing the walking skeleton takes a surprising amount of effort First, because deciding what to do will ush out all sorts of questions about the application and its place in the world Second, because the automation of building, packaging, and deploying into a production-like environment (once we know what that means) will ush out all sorts of technical and organizational questions
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Iteration Zero
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In most Agile projects, there s a rst stage where the team is doing initial analysis, setting up its physical and technical environments, and otherwise getting started The team isn t adding much visible functionality since almost all the work is infrastructure, so it might not make sense to count this as a conventional iteration for scheduling purposes A common practice is to call this step iteration zero: iteration because the team still needs to time-box its activities and zero because it s before functional development starts in iteration one One important task for iteration zero is to use the walking skeleton to test-drive the initial architecture
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