If I had more time I would have written less code

In a a blatant rip-off of the T.S Eliot quote: “if I had more time, I would have written a shorter letter” I had a thought the other day, perhaps:

If I had more time, I would have written less code

It seems to me the more time time I spend on a problem, the less code I usually end up with; I’ll refactor and usually find a more elegant design – resulting in less code and a better solution. This is at the heart of the programmer’s instinct that good code takes longer to write than crap. But as Uncle Bob tells us:

The only way to go fast is to go well

How then do we square this contradiction? The way to go fast is to go well; but if I sacrifice quality I can go faster – so I’m able to rush crap out quickly.

What makes us rush?

First off – why do developers try to rush through work? It’s the same old story that I’m sure we’ve all heard a million times:

  • There’s an immovable deadline: advertising has already been bought; or some external event – could be Y2K or a big sports event
  • We need to recognise the revenue for this change in this quarter so we make our numbers
  • Somebody, somewhere has promised this and doesn’t want to lose face by admitting they were wrong – so the dev team get to bend so those who over committed don’t look foolish

What happens when we rush?

The most common form of rushing is to skip refactoring. The diabolical manager looks at the Red, Green, Refactor cycle and can see a 33% improvement if those pesky developers will just stop their meddlesome refactoring.

Of course, it doesn’t take a diabolical manager – developers will sometimes skip refactoring in the name of getting something functional out the door quicker.

It’s ok though, we’ll come back and fix this in phase 2

How many times have we heard this shit? Why do we still believe it? Seriously, I think my epitaph should be “Now working on phase 2”.

Another common mistake is to dive straight in to writing code. When you’re growing your software guided by tests, this probably isn’t the end of the world as a good design should emerge. But sometimes 5 minutes thought before you dive in can save you hours of headache later.

And finally, the most egregious rush I’ve ever seen is attempting to start development from “high level requirements”. As the “inconsequential little details” are added in, the requirements look completely different. And all that work spent getting a “head start” is now completely wasted. You now either bin it and do-over, or waste more precious time re-working something you should never have written in the first place.

Does rushing work?

This is the heart of the contradiction – it feels like it does. That’s the reason we do it, isn’t it? When compelled by the customer to finish quicker, we rush – we cut corners to try and get things done quicker.

It feels like I’m going quicker when I cut corners. If only it wasn’t for all those unexpected delays that wasted my time then I would have been finished quicker. Its not my fault those delays cropped up – I couldn’t have predicted that.

It’s the product manager’s fault for not making the requirements clear

It’s the architect’s fault for not telling me about the new guidelines

Its just unlucky that a couple of bugs QA found were really hard to fix

When you cut corners, you pay for it later. Time not spent discussing the requirements in detail leads to misunderstandings; if you don’t spot it later on, you might have to wait until the show and tell for the customer to spot it – now you’ve wasted loads of time. Time not spent thinking about the design can lead to you going down an architectural blind alley that causes loads of rework. Finally time not spent refactoring leaves you with a pile of crap that will be harder to change when you start work on the next story, or even have to make changes for this one. Of course, you couldn’t have seen these problems coming – you did your best, these things crop up in software don’t they?

But what if you hadn’t rushed? What if rather than diving in, you’d spent another 15 minutes discussing the requirements in detail with the customer? You might have realised earlier that you had it all wrong and completely misunderstood what she wanted. What if you spent 30 minutes round a whiteboard with a colleague discussing the design? Maybe he would have pointed out the flaws in your ideas before you started coding. Finally, what if you’d spent a bit more time refactoring? That spaghetti mess you’re going to swear about next week and spend days trying to unravel will still be fresh in your mind and easier to untangle. For the sake of an hour’s work you could save yourself days.

How much is enough?

Of course, it’s all very well to say we will not write crap any more; but it’s not a binary distinction, is it? There’s a sliding scale from highly polished only-really-suitable-for-academics perfection; to sheer, unmitigated, what-were-you-thinking-you-brain-dead-fuck crapitude.

If spending more time discussing requirements could save time later, why not spend years going through a detailed requirements gathering exercise? If spending more time thinking before coding could save time later, why not design the whole thing down to the finest detail before any coding is done? Finally if refactoring mercilessly will save time, why not spend time refactoring everything to be as simple as possible? Actually, wait, this last one probably is a good idea.

Professional software development is always a balancing act. It’s a judgement call to know how much time is enough.

How long does it take?

When working through a development task I choose to expend a certain amount extra effort over and above how long it takes me to type in the code and test it; this extra time is spent discussing requirements, arguing about the design, refactoring the code etc etc. Ideally I want to expend just enough effort to get the job done as quickly as possible (the lazy and impatient developer). If I expend too little effort I risk being delayed later by unnecessary rework; if I expend too much effort I’ve wasted my time.

However, I don’t know in advance what that optimum amount of effort is – it’s a guess based on experience. But I expect the amount of effort I put in to be within some range of the optimum – the lowest the point on the graph:

All other things being equal, I’d expect the amount of time it actually takes to complete the task to be within some margin based on how close I got to the optimum amount of effort. Sometimes I do too little and waste time with rework. Other times I spend too long – e.g. too much detail in the design that didn’t add any value – so the extra time I spent is wasted.

This is by no means all the uncertainty in an estimate; but this is the difference between me not doing quite enough and having to pay for it later (refactoring, debugging or plain rework); versus doing just enough at every stage so that no effort is wasted and there’s no rework I could have avoided more cheaply. In reality the time taken is likely to be somewhere in the middle: not to great but not too shabby.

There’s an interesting exercise here to consider the impact experience has on this. When I was first starting out I’d jump straight into coding; my effort range would be to the left of the graph: I’d spend most of my time re-writing what I’d done so the actual time taken would be huge. Similarly, as I became more experienced I’d spend ages clarifying requirements, writing detailed designs and refactoring until the code was perfect; now my effort range would be to the right of the graph – I’d expend considerable upfront effort, much of which was unnecessary. Now, I’d like to think, I’m a bit more balanced and try to do just enough. I have no idea how you could measure this, though.

Reducing effort to save time

What happens when we rush? I think when we try to finish tasks quicker, we cut down on the extra effort – we’re more likely to accept requirements as-is than challenge them; we’re more likely to settle for the first design idea we think of; we’re more likely to leave the code poorly refactored. This pulls the effort range on the graph to the left.

To try and get done more quickly, I’ve reduced the amount of effort by “shooting low”: I cut corners and expend less effort than I would have done otherwise.

The trouble is this doesn’t make the best-case any better – I might still get the amount of effort bang on and spend the minimum amount of time possible on this task. However because I’m shooting low, there’s a danger now I spend far too little extra effort – the result is I spend even longer: I have to revisit requirements late in the day; make sweeping design changes to existing code; or waste time debugging or refactoring poorly written code.

This is a classic symptom of a team rushing through work: simple mistakes are made that, in hindsight, are obvious – but because we skipped discussing requirements or skipped discussing the design we never noticed them.

When I reduce the amount of extra effort I put in, rather than getting things done quicker, rushing may actually increase the time taken. This is the counter-intuitive world we live in – where aggressive deadlines may actually make things go more slowly. Perhaps instead I should have called this article:

If I had more time I would have been done quicker

The true cost of technical debt

Whether you like to think of it as technical debt or an unhedged call option we’re all surrounded by bad code, bad decisions and their lasting impact on our day to day lives. But what is the long term impact of these decisions? Are we really making prudent choices? Martin Fowler talks about the four classes of technical debt – from reckless and deliberate to inadvertent and prudent.

Deliberate reckless debt

Deliberate reckless technical debt is just that: developers (or their managers) allowing decisions to be made that offer no upside and only downside – e.g. abandoning TDD or not doing any design. Whichever way you look at it, this is just plain unprofessional. If the developers aren’t capable of making sensible choices, then management should have stepped in to bring in people that could. Michael Norton labels this “cruft not technical debt“. If we’re getting no benefit and simply giving ourselves an excuse to write crappy code then it’s not technical debt, it’s just crap.

Inadvertent debt

Inadvertent technical debt is tricky. If we didn’t know any better, how could we have done any differently? Perhaps industry standards or best practices have moved on. I’m sure once upon a time EJBs were seen as a good idea, now they look like pure technical debt. Today’s best practice so easily becomes tomorrow’s code smell.

Or perhaps we’d never worked in this domain before, if we had the domain knowledge when we started – maybe the design would have turned out different. Sometimes technical debt is inevitable and unavoidable.

Prudent deliberate debt

Then there’s prudent, deliberate debt. Where we make a conscious choice to add technical debt. This is a pretty common decision:

We need to recognise the revenue this quarter, no matter what

We’ve got marketing initiatives lined up so we’ve got to hit that date

We’ve committed to a schedule so don’t have time for rework

Sometimes, we have to make compromises: by doing a sub-standard job now, we get the benefit of finishing faster but we pay the price later.

Unlike the other types of technical debt, this is specifically a technical compromise. We’ve made a conscious decision to leave the code in a worse state than we should do. We know this will slow us down later; we know we need to come back and fix it in “phase 2”; but to hit the date, we accept compromise.

Is it always the right decision?

1. Compromise is always faster in the short-term and slower in the long-term

Given a choice between what we need now and some unspecified “debt” to deal with later – the obvious choice is always to accept compromise.

2. Each compromise is minor, but they compound

Unlike how most people experience “debt”, technical debt compounds. Each compromise we accept increases the cost of all the existing debt as well. This means the cost of each individual compromise may be small, but together they can have a massive impact.

First of all I decide not to refactor some code. Next time round, because its not well factored, it’s harder to test, so I skip some unit tests. Third time round, my test coverage is poor, so I don’t have the confidence to refactor extensively. Now it’s getting really hard to test and really hard to change. Little by little, but faster and faster, my code is deteriorating. Each compromise piles on the ones that went before and amplifies them. Each decision is minor, but they add up to a big headache.

3. It’s hard to quantify the long term cost

When we agree not to rework a section of code, when we agree to leave something half-finished, when we agree to rush something through with minimal tests: it’s very difficult to estimate the long term cost. Sure, we can estimate what it would take to do it right – we know what the principal is. But how can we estimate the interest payments? Especially when they compound.

How can I estimate the time wasted figuring out the complexity next time? The time lost because a bug is harder to track down. The extra time it takes because I can’t refactor the code so easily next time. The extra time it takes because I daren’t refactor the code next time; and the extra debt this forces me to take on. How can I possibly quantify this?

At IMVU they found they:

underestimated the long-term costs [of technical debt] by at least an order of magnitude

Is it always wrong?

There are obviously cases where it makes sense to add technical debt; or at least, to do something half-assed. If you want to get a new feature in front of customers to judge whether its valuable, it doesn’t need to be perfect, it just needs to be out there quickly. If the feature isn’t useful for users, you remove it. You’ve saved the cost of building it “perfectly” and quickly gained the knowledge you needed. This is clearly a cost-effective, lean way to manage development.

But what if the feature is successful? Then you need a plan for cleaning it up; for refactoring it; making sure it’s well tested and documented sufficiently. This is the debt. As long as you have a plan for removing it, whether the feature is useful or not – then it’s a perfectly valid approach. What isn’t an option is leaving the half-assed feature in the code base for years to come.

The difference is having a plan to remove the debt. How often do we accept compromise with a vague promise to “come back and fix later” or my personal favourite “we’ll fix that in phase 2”. My epitaph should be “now working on phase 2”.

Leaving debt in the code with no plan to remove it is like the guy who pays the interest on one credit card with another. You’re letting the debt mount up, not dealing with it. Without a plan to repay the debt, you will eventually go bankrupt.

The Risk of Technical Debt

Perhaps the biggest danger of technical debt is the risk that it represents. Technical debt makes our code more brittle, less easy to change. As @bertvanbrakel said when we discussed this recently:

Technical debt is a measure of code inflexibility

The harder it is to change, the more debt laden our code. With this inflexibility, comes the biggest risk of all: that we cannot change the code fast enough. What if the competitive or regulatory environment suddenly changes? If a new competitor launches that completely changes our industry, how long does it take us to catch up? If we have an inflexible code base, what will be left of our business in 2, 3 or 4 years when we finally catch up?

While this is clearly a worst case scenario, this lack of flexibility – this lack of innovation – hurts companies little by little. Once revolutionary companies become staid, unable to react and release only derivative products. As companies find themselves unable to innovate and keep up with the ever changing landscape – they risk becoming irrelevant. This is the true cost of technical debt.

Without a plan to repay the technical debt; with no way to reliably estimate the long term cost of not repaying it, are we really making prudent, deliberate choices? Isn’t the decision to add technical debt simply reckless?

Is agile about developers (any more)?

I spent last week at the Agile 2010 Conference. It was my first time at a conference this size; I definitely found it interesting and there were some thought provoking sessions – but there weren’t many deeply technical talks. As others have asked, what happened to the programmers?

Bob Martin wrote that

Programmers started the agile movement to get closer to customers not project managers

He also commented on how few talks were about programming

< 10% of the talks at #agile2010 are about programming. Is programming really < 10% of Agile?

People have already commented on how cost is a factor in attending a conference like this – especially for those of us outside the US who have expensive flights to contend with, too. This is certainly a factor, but I wonder if this is the real problem?

Do developers attend a conference like Agile 2010 to improve their craft? How much can you cover in a 90 minute session? Sure, you can get an introduction to a new topic – but how much detail can you get into? Isn’t learning the craft fundamentally a practical task? You need hands on experience and feedback to really learn. In a short session with a 100+ people are you actually gonna improve your craft?

Take TDD as an arbitrary example. The basic idea can be explained fairly quickly. A 90 minute session can give you a good introduction and some hands on experience – but to really grok the idea, to really see the benefit, you need to see it applied to the real world and take it back to the day job. I think the same applies to any technical talk – if its interesting enough to be challenging, 90 minutes isn’t going to do it justice.

This is exacerbated by agile being such a broad church; there were developers specialising in Java, C#, Ruby and a host of other languages. Its difficult to pitch a technical talk that’s challenging and interesting that doesn’t turn off the majority of developers that don’t use your chosen language.

That’s not to say a conference like Agile 2010 isn’t valuable, and I’m intrigued to see where XP Universe 2011 gets to. However, I think the work that Jason Gorman is doing on Software Craftsmanship, for example, is a more successful format for technical learning – but this is focused clearly on the technical, rather than improving our software delivery process.

Isn’t the problem that Agile isn’t about programming? It is – or at least has become – management science. Agile is a way of managing software projects, of structuring organisations, of engaging with customers – aiming to deliver incremental value as quickly as possible. Nothing in this dictates technical practices or technologies. Sure, XP has some things to say about practices; but scrum, lean, kanban et al are much more about the processes and principles than specific technical approaches.

Aren’t the biggest problems with making our workplaces more agile – and in fact the biggest problems in software engineering in general –  management ones, not development ones? Its pretty rare to find a developer that tells you TDD is bad, that refactoring makes code worse, that continuous integration is a waste of time, that OOD leads to worse software. But its pretty common to find customers that want the moon on a stick, and want it yesterday; managers that value individual efficiency over team effectiveness, that create distinct functional teams and hinder communication.

There is always more for us to learn; we’re improving our craft all the time. But I don’t believe the biggest problems in software are the developers. Its more common for a developer to complain about the number of meetings they’re asked to attend, than the standard of code written by their peers.

Peers can be educated, crap management abides.