The Iceberg Model

An iceberg

When I think of stikis, I think of little squares that you can move around and type into and being able to zoom around the page. Writing the code to do these things was lot of work, but I’m beginning to appreciate that it’s only a small proportion of the total amount of work required to keep a site like this running. There are lots of other less glamorous things, such as writing help pages, making sure software is kept up to date, deleting spam comments from the wiki, responding to emails, and writing blog posts. In this way, stikis is sort of like an iceberg. There’s the small visible part out the top and the big hidden part beneath.

Models of the software development process often focus on the steps involved and how they relate to one another in a sequence. For example, the famous waterfall model represents software design as happening in stages from requirements gathering, to specification, to implementation, testing, integration and maintenance. Another well known model, the spiral model, while more sophisticated (giving more attention to iterative aspects of software development) is still constructed around the idea of stages and progression.

Models like this are especially useful as resources for project management and planning because they highlight dependencies between stages thereby allowing project managers to assign and coordinate organisational responsibilities. However, in a single developer project - like stikis - these organisational aspects are less important. What instead becomes difficult is maintaining a balance between all the different tasks that are required. This is especially so in a web-application context, where development, testing, maintenance and support are running alongside an already deployed application. In this case, I think it might be more useful to think of software development as being like an iceberg, rather than a waterfall or spiral.

The thing about icebergs is that they need to maintain a balance between the small visible part and the larger hidden part. If they don’t then the iceberg’s going to tip over (and the penguins won’t be happy). This is where thinking about your development work as an iceberg gets useful. The fun parts above the water are always calling for your attention, but if you spend all your time working there, you’ll eventually end up with help pages that are out of date, tests that don’t test the right things and spam-filled forums.

I’m not sure of the exact numbers, but if we assume that 86% of the average iceberg is beneath the water and 14% above - then that means for every hour you spend working on new features, you need to spend 6 working on the other stuff. Conveniently for the single developer, this means that you can plan your week of spare-time-development something like:

  • mon: interaction design
  • tue: write tests (software design)
  • wed: develop
  • thu: documentation
  • fri: blog
  • sat: deploy
  • sun: server maintenance & review usage

…or some other order - provided enough time is spent on each of the activities. (Support emails should be answered as soon as possible.)

Does this seem sane?