September 20, 2011

...Learn TDD with Codemanship

Don't Sell Your Customer Short With Code Quackery

There was a time when nobody had heard of "germs".

Back in the days before microbiology, life was - for most people - short and brutal. And folk believed all sorts of nonsense about what was causing their illnesses and how to cure themselves, most of which was about effective as eating scraps of paper with the word "cure" scribbled on them.

Then, one day, someone took a look at some "clean" water under a new invention - a sort of backwards telescope - and saw millions of tiny little animals swimming about in it (and, no doubt, peeing and pooing in it, too; the dirty little monkeys!)

We now understand that these single-celled organisms are able to invade our bodies via various conveniently-placed orifices and do unspeakable things to the cells inside us, producing symptoms ranging from a mild case of the lergy all the way up to severe bouts of chronic death.

We've learned that we can "bug-proof" our bodies against the effects of these nasty little critters by exposing our immune systems to milder, more polite versions of them. And, apart from one or two slightly ill-informed swimsuit models, most right-minded people accept that immunisation is the way to go if we want to live long, happy, death-free lives.

If you were to fall through a time warp and end up in the days before microscopes and microbiology and try to explain to someone with, say, a bad head cold that their symptoms are caused by tiny invisible creatures attacking the insides of their bodies, they wouldn't have believed you.

Head colds are obviously caused by demonic possession, they'd say, before promptly having you shipped off to the funny farm to have holes drilled into your mind by part-time hairdressers.

As software developers, we live in pre-enlightenment times where our customers and our managers are concerned.

Most non-technical stakeholders in software applications are well aware of the symptoms of poor code quality, but our attempts to convince them that schedule delays, cost overruns, high bug counts, spiralling support and maintenance costs and, ultimately, product death can be caused by tiny, invisible code problems like missing unit tests, switch statements and copy-and-paste inheritance have largely failed.

Programmers like me have observed these software germs under our microscopes and witnessed them attacking the cells of our application, turning young healthy modules into wheezy old decrepit blobs. And we've seen how, as the infection spreads, symptoms start to manifest at the system level and beyond. We have seen entire businesses killed by code quality problems.

But the average customer or senior manager is often unwilling to take it on trust that the problems they're suffering could have any connection to whether or not programmers chose meaningful variable names, or broke down complex functions to make them simpler and more testable.

They don't understand that code needs to be immunised against the worst of these problems with high automated test assurance and continuous monitoring of code quality. Nor do they understand the need to maintain a healthy immune system through practices like refactoring - the programming equivalent of your 5 a day.

They're currently happy to continue with their superstitions and software quackery - things they can see and believe in, like hiring more programmers or creating more documentation, even if there's no hard evidence that they work, and plenty of evidence that they make the symptoms worse.

We'd do well to remember that we are the doctors and they are the patients. We must stop humouring them and asking them what treatment they want us to give them, and instead focus on proper and thorough diagnosis, and offering them treatments that we know from evidence tend to work.

They may reject our advice and seek the help of witch doctors and voodoo, but the solution is not to throw up our hands in defeat and become witch doctors ourselves. Every time we do that, we reinforce their superstitions and our hypocrisy is paid for with the blood of a million dead code bases and hundreds of billions of pounds a year in lost business opportunities.

Posted 9 years, 7 months ago on September 20, 2011