If you have followed my blog, you know that I am somewhat critic of root cause analysis like the „5 Whys„, especially when applied to non-purely-technical issues.
On the other hand I am actually pretty much in favour of more systemic tools like the Cause-Effect Diagrams and the Thinking Process, despite the risk of using an oversimplified and/or incomplete version of these methods.
While preparing for my „Agile as a Systemic Change“ presentation I realised one more detail that confirmed my skepticism in the 5 Whys: the lack of circularity!
One of the peculiar characteristics of a system is the presence of loops, i.e. cause-effect connections that end up creating a closed loop, reinforcing a certain situation, like this:
These loops are exactly the features we search for in a system as they are the endemic and self-enforcing reasons of the behaviour of a system.
On the top of asking why – which is, in my view, a dangerous way to analyse a system – the 5 whys is a way to „go back“ in the cause-effect chain for a while:
[The picture is built from right to left: we find A, we search for the cause finding B, we search for the cause of B we find C, …]
If we’re lucky we might even find a loop:
but if it happens it happens by pure chance.
What I recently used with some success is, instead, a technique I developed and called Three Hows, where, for each effect, I ask something like „How does effect A happen?“, and asking this questions at least three times but usually even more („And how else does effect A happen?“, „And how else?“):
And then back for each cause of A:
Thus maximising the chances of finding a loop:
In this process, I refrain from asking „why“ as a question and use „how“, though also „what“ is a good alternative. Anyway, I try as much as possible to use the client’s language and the client’s reality, avoiding to add my content in the discussion, even in the form of a question.
As I said, I had some success with it and I will test it more on the field. At the same time, I am looking for your feedback: does it work for you? Either way, I’d love to hear your experiences with this.