Lean Thinking

04 September 2018

Last Responsible Moment

Written by Published in Agile

Probably the least understood (or most misunderstood) lean principle is "decide as late as possible". I have seen it used to justify all sorts of weird decision-making policies that generally involve never making decisions, because surely as late as possible means leaving it until the absolute last possible moment, or even later. I have seldom, if ever, seen it applied correctly. So let's take a look at this principle and see what it really means.

The other way to express this principle is "defer decisions until the last responsible moment". There are two points of confusion here. The first is what is the last responsible moment? The other is what exactly do we mean by deferring decisions? Let's look at the last responsible moment. What is the last responsible moment? Does it mean the absolute last minute? Do we leave all decisions until we are absolutely forced to make one because otherwise the whole endeavour will fall flat? No. That makes no sense at all. Leaving decisions until they are forced upon you is hardly being responsible. Does it mean making decisions early because that's the responsible thing to do? Again, no. Making decisions early isn't using the last responsible moment. The last responsible moment is a really hard thing to define, so let's not try. Let's re-word it instead. The intent of the last responsible moment is to make decisions with the maximum possible information.

21 August 2018

Rigidity = Fragility

Written by Published in Agile

"We need to harden this process...make it more robust. Too many things are slipping through the cracks". How many times have you heard statements like that? Things that don't fit the process take extra time to resolve, so we make sure that the process covers as much as possible. As issues arise, we tighten the process still further. Spell out the entry criteria. Map the process steps in great detail. The problem is, of course, that no matter how much detail we have in the process, things still don't always fit so we document and harden even more.

We create processes and because we are humans working with incomplete information, there are gaps. Our natural instinct then is to fill in the gaps. Tighten the process. Specify, document, enforce. The problem is that this simply doesn't work. The real world conspires against us. Customers don't always want the standard product. You may have a carefully documented 30 day SLA but that doesn't help a bit when a key customer rings up and says "We know it's usually 30 days but we really need it in 10, can you please help? If not, your competitor has said they can do it in 10 days." You may only sell in lots of 100 but what happens if a good customer rings up and asks for an extra 35 because they have had a spike in sales but don't have the space to store another full hundred? The more rigid we make our processes the more often they break down.

Written by Published in Agile

Vampires are lame. There it is, standing at your front door, cape, fangs, the full works. You have opened the door, it's looking at you, getting hungrier and hungrier. It's starting to drool. You are looking at it from inside. Giving it the finger. Perfectly safe. Why? Because according to the stories, vampires need permission to enter. You are perfectly safe as long as you don't say "please come in". Of course if they catch you out in the open later without a front door to give you protection, you might just regret giving them that finger.

So why am I telling you this? Because coaches have something in common with vampires. Capes? No. Because we descend on organisations and suck them dry? No. It's because we also need permission before we can do what we are there to do. We need permission to coach. But surely, I hear you say, you have permission. After all, you have been hired to coach, therefore you have permission to do so. Sadly, it's not that simple. What we usually have is permission to be there, not permission to coach.

Written by Published in Agile

Last time we looked at refactoring. How real refactoring isn't re-writing big chunks of legacy code, it's cleaning as you go. Making sure the code you write now is clean. But what do you do about those big lumps of legacy? They weren't written with "clean" in mind, they were written with "hack it together to meet the date" in mind instead. It's messy and it's slowing you down. What do we do about it?

Well, we need to refactor it. But how, if we can't spend the whole sprint rewriting a big chunk of it? We need to stop thinking big - think small instead. Use the Boy Scout Principle - leave the camp ground cleaner than when you found it. When scouts leave a camp ground, they spend a few minutes cleaning up. Not just their rubbish but anything else they can find left by previous campers. And crucially, they don't try to clean up the whole forest, or even the whole camp-site - that would take weeks - they just clean up the area they were using.

Calendar

« April 2019 »
Mon Tue Wed Thu Fri Sat Sun
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30