… then a software team is like an aquarium.“Programming is Gardening, not Engineering” says Andy Hunt (of Pragmatic Programmer fame) in one of his well-known Artima conversations. Inspired by such an interesting ‘organical’ comparison, it’s my metaphor of a software team which behaves quite like an aquarium. I assume not all my blog readers are aquaria hobbists, so let me explain: - Permanent monitoring and adjusting. Left alone and unsupervised, an aquarium apparently manages to ‘survive’ by itself. However, subtle changes in water chemistry will slowly start to build up. Interesting fact is that fishes seem to cope well with these changes – until a certain balance is reached and they get sick and eventually die. In my experience, the threshold is rather thin, one day everything seems ok and the next day it’s a major disaster. The effort necessary to clean up the situation is significantly bigger than the effort spared by not taking care of the aquarium. The parallel here is quite obvious : you can’t manage what you can’t measure, you can’t control what you can’t manage. Software metrics, code reviews, frequent releases, testing and feedback, these practices are vital if you want a ‘healthy’ project and a ‘living’ team. Otherwise, beware, the inflexion point might be just a few days away*. - However, changes must be done gradually. Supposing that a major shift in water parameters was detected, taking immediate and radical measures will generally worsen the situation (unless the catastrophy is already there). It is highly recommended to distribute the change over a reasonable period of time and generally never try to influence two major water parameters at the same time (Ph and Gh for instance). Explanation: all these parameters are interconnected in intricate ways, by changing one you’ll automatically influence the others. By changing two or more, the outcome is hard to predict and might open the path to a disaster. There’s a nice parallel here. A major change in methodology with sudden introduction of multiple new/modified development practices, will only make the team unstable. Even if, globally speaking, the change is a highly beneficial one. ‘Good things come to those who wait’ … and measure … and change … and wait … and measure … and change … - A beautiful aquarium is a visible one. Transparent glass, lights and everything. You wouldn’t feed and keep your fishes if they were living in a black box and you are afraid to look inside it ? *Of course [and fortunately], the developers do not get sick because of a reeking team/project, they simply leave.