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Y=f(x)

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Causal theory, in Six Sigma terms, means that you create output (y) from an input (x) and a function (f). Clear as mud so far? Don’t worry.

It’s made up of three components:

  • y: What you get out of a process. In a manufacturing context, this is a physical product.
  • x: What you put into a process. In the same manufacturing context, this is a material or part.
  • f: What you do to turn x into y. In manufacturing, this is a machining or assembly procedure.
y = f(x)
Output = method * input

Using Causal Theory in Six Sigma

When you have a problem with your output (y), causal theory tells you that there are two possible culprits:

  • f: Your procedure for creating that output.
  • x: The materials or information you’re adding to that procedure.

Using Causal Theory with Multi-Step Processes

Very few processes will be simple enough that you can pinpoint either your procedure or material as the issue and voila, solved! So you’ll often need to break down the causal theory equation:

ytotal = y1 + y2 + y3 + ... + yn

Translation: Your total output from a process is the sum of the output from each sub-process within it.

This means that if you have trouble with your output from a complex process, a good starting point is to break down that process into sub-processes. Then, look at the output from each sub-process. Where does the problem creep in? Once you find the problem sub-process, you can move to figuring out whether your input or procedure is the cause.

Correlation and Causation

It’s important to note that sometimes you’ll run into confusion between correlation and causation. You need to understand the difference, and know how to distinguish them.

Correlation: A relationship between two events. They occurred at much the same time, in the same population, or in the same circumstances. For example, spilling a glass of milk and dropping an egg. They might occur at the same time, and they might have the same cause – clumsiness or a fright. But one would rarely cause the other to happen.

Causation: A causative relationship between two events; one caused the other to happen. For example, dropping an egg could cause it to land on the floor. These will also happen at almost the same time, by human observation. But unlike the milk-and-egg example, one – dropping an egg – can be shown to directly cause the other – it landing on the floor.

Separate correlation and causation by identifying variables in your procedure (f) or input (x) and, where possible, change only one variable at a time. When you find that changing a makes a difference to the output but changing b doesn’t, you’ve found that a has a causative effect.

Applying Causal Theory to DMAIC

In a practical sense, here’s how you can use causal theory in your DMAIC cycles:

  • Define: Look at your outputs (y) and clearly distinguish the issue that you’re facing. For example, the end size of a product is not within acceptable levels of consistency.
  • Measure: Measure your inputs (x) and outputs (y). For example, take measurements of product parts at each stage in the process, and check material strength, density and composition.
  • Analyze: Prioritize your outputs (y). Which ones are most contributing to the issue? Test whether issues in your highest-priority sub-processes are caused by the input (x) or the procedures (f). For example, vary material qualities in some tests and the manufacturing sub-procedure in others.
  • Improve: Implement strategies to improve your input (x) or procedures (f) for high-priority sub-processes. Do these alleviate the problem? For example, if substandard materials have caused a lot of the variation, switch suppliers and temporarily check quality rigorously. Then check that the change in materials has improved the end product.
  • Control: Put measures in place to monitor future input (x) and procedures (f). For example, run a weekly spot-check on new inventory of materials.

Using an Input Map with Causal Theory

You can use an input map to show the inputs (x) and outputs (y) of each procedure (f) in your process. We’ll use a simple process that’s familiar to most of us – a morning breakfast routine. You can use a spreadsheet or a mind-map type diagram to give you a visual representation of your mapping.

1. List your procedures

Look at your process and determine the discrete procedures in place. For example, in a morning breakfast routine, you might have:

  • Make a mug of coffee
  • Make toast with jam
  • Read news on tablet
  • Have breakfast
  • Wash breakfast dishes.

Each procedure will be in the middle of its own input map.

Inputs Procedure Outputs
  Make a mug of coffee  
   
   
   
   
  Make toast with jam  
   
   
   
   
  Read news on tablet  
   
   
   
   
  Have breakfast  
   
   
   
   
  Wash breakfast dishes  
   
   
   
   

2. Find your inputs for each procedure

What do you need to complete the procedure? Think about everything that the operator needs to use. For example, ‘make a mug of coffee’ in our breakfast routine might require:

  • Coffee machine
  • Electricity supply
  • Coffee pod
  • Mug
  • Sugar
  • Milk or creamer
  • Spoon
Inputs Procedure Outputs
Coffee machine Make a mug of coffee  
Electricity supply  
Coffee pod  
Mug  
Sugar  
Milk or creamer  
Spoon  
Toaster Make toast with jam  
Electricity supply  
Butter  
Jam  
Knife  
Plate  
Tablet with charged battery Read news on tablet  
News service  
Spectacles  
Coffee in mug Have breakfast  
Toast on plate  
Appetite  
Teeth  
Hot water Wash breakfast dishes  
Dishwashing liquid  
Dirty plate  
Used mug  
Dirty spoon  
Dishcloth  

3. Record your outputs for each procedure

Your outputs are what you get out of each procedure. You have two choices here:

  • List every single output from the procedure
  • List only the output that you’re interested in.

For this example, we’ll only list the output that feeds into other procedures, and the end product.

Inputs Procedure Outputs
Coffee machine Make a mug of coffee Mug of hot coffee, to taste
Electricity supply  
Coffee pod  
Mug  
Sugar  
Milk or creamer  
Spoon  
Toaster Make toast with jam Toast with jam on a plate
Electricity supply  
Butter  
Jam  
Knife  
Plate  
Tablet with charged battery Read news on tablet Entertainment
News service  
Spectacles  
Coffee in mug Have breakfast Dirty dishes
Toast on plate Full stomach
Appetite Feeling of wakefulness
Teeth  
Hot water Wash breakfast dishes Clean plate
Dishwashing liquid Clean mug
Dirty plate Clean spoon
Used mug  
Dirty spoon  
Dishcloth  

4. Link inputs to your output of interest

Next, follow the trail backwards from your problem output to input that might be affecting it.

For example, say I’m finding it hard to stay awake at work this morning. Weird – I had breakfast, which always includes coffee. I can follow my input back from the output and highlight the trail.

Inputs Procedure Outputs
Coffee machine Make a mug of coffee Mug of hot coffee, to taste
Electricity supply  
Coffee pod  
Mug  
Sugar  
Milk or creamer  
Spoon  
Toaster Make toast with jam Toast with jam on a plate
Electricity supply  
Butter  
Jam  
Knife  
Plate  
Tablet with charged battery Read news on tablet Entertainment
News service  
Spectacles  
Coffee in mug Have breakfast Dirty dishes
Toast on plate Full stomach
Appetite Feeling of wakefulness
Teeth  
Hot water Wash breakfast dishes Clean plate
Dishwashing liquid Clean mug
Dirty plate Clean spoon
Used mug  
Dirty spoon  
Dishcloth  

Primary procedure

First, I check my main output. Is my stomach full? Yes. So I must have had breakfast. My memory of this morning agrees. Yes, I had breakfast; toast and coffee. That procedure (f) isn’t the problem.

Primary input

Second, I look at the input (x) for my breakfast procedure. The relevant item is the mug of coffee. If there isn’t a problem with f, causal theory tells me, there must be a problem with x.

Secondary procedure

Third, I look at the making coffee procedure. I remember making and drinking my coffee without issues, so the procedure (f) would seem to be fine. What about the inputs (x)?

Secondary inputs

Fourth, I look at the coffee procedure inputs. If I made the coffee without issues and it was hot when I drank it, that would tend to rule out issues with the coffee machine or electricity. If I didn’t notice any issues with the taste, that would probably rule out problems with the milk or sugar inputs. I can’t imagine any scenario where the choice of mug or spoon would affect my wakefulness later on, so I rule out those inputs for now. What about the coffee pods? They seem the most likely candidate left.

Further investigation

Fifth, I check the coffee pod input in depth. I find the open box of pods – and ta-da! They’re labelled as decaf. I check the rubbish bin to confirm; the pod from this morning is lying on top, and it’s clearly marked as decaf. I’ve found the source of the problem: one of my inputs (coffee pod) was incorrect. This caused a flow-on issue with the output (mug of coffee) from a sub-process, which was the input in the Have breakfast procedure. This incorrect input (mug of decaf coffee) caused an issue with the output of the whole process (feeling of wakefulness).

Conclusion

While the above example is a bit farcical, it does give you a simple example of how using causal theory and an input map can help you to track issues in output back to their causes.

Things to remember

Keep these points in mind:

  • A problem with your output (y) has two potential sources: your input (x) and your procedure (f).
  • These two potential sources are not exclusive. You could have an issue with both your input (x) and your procedure (f).
  • Most processes are complex enough that you’ll need to break them down into multiple sub-processes, each with their own input and procedure.
  • Prioritize your problem outputs. In other words: focus on the larger problems first. You can fine-tune later.
  • Problems in a sub-process can be replicated and enlarged as its output moves through subsequent sub-processes. Ensure that you drill down to the ultimate source of the issue.
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