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11.2 Applying root cause analysis and fishbone diagrams - Coggle Diagram
11.2 Applying root cause analysis and fishbone diagrams
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what is root cause analysis?
prioritizing the causes - human intervention, machine could have been moved, accidental removal when removing other wires
identifying solutions to the underlying problem - plug the cable in to reconnect to the internet
identifying what caused the problem - the ethernet cable was unplugged
implementing the change - physically plug the Ethernet cable back in
collecting data relating to the problem - cable(s) unplugged, internet access is not working
ensuring the improvements are monitored and sustained - regular checks to ensure the cable does not continue to become unplugged
defining the problem - the internet isnt working and users cannot connect
root cause analysis is the process of discovering the root causes of problems in order to identify appropriate solutions e.g. what happened? how it happened? why is happened? how to stop it from happening again.
fishbone diagrams
a fishbone diagram is a visual root cause analysis tool to identify the possible causes of the identified problem(s)
it allows you to get down to the real root cause of the issue, rather than solving its symptom.
a fishbone diagram may also be referred to as a cause and effect diagram, an ishikawa diagram or a herringbone diagram
you should consider using a fishbone diagram: to identify possible causes to an issue and when your team's thinking and brainstorming tends to get stuck or stagnates.
the 6 steps of a fishbone diagram
write the categories of causes as branches off the central line
identify all the possible causes of the problem(s) by asking why. add ideas as a branch from the categories
identify the major categories causing the problem(s)
continue to ask why about each cause and write a sub causes branching off the causes identified above
agree on a problem statement
when you run out of ideas, focus attention to places on the diagram where ideas are limited
what is root cause analysis?
root cause analysis is a process in which you break down the points as to which is or has caused a problem within a digital environment
what is the purpose of root cause analysis?
the purpose of root cause analysis is to diagnose the problem encountered to fix it and make sure it doesn't occur in the future
what are the 5 different methods of root cause analysis?
Scatter Diagram
a scatter plot or diagram uses pairs of data points to help uncover relationships between variables. a scatter plot is a quantitative method for determining whether two variables are correlated such as testing potential causes identified in your fishbone diagram.
Failure Mode and Effects Analysis (FMEA)
the FMEA is a method used during product or process design to explore potential defects or failures, a FMEA chart outlines:
current controls to prevent each type of failure
severity (S), occurrence (O) and detection (D) ratings that allow you to calculate a risk priority number (RPN) for determining further action
potential failures, consequences and causes
Fishbone Diagram
a fishbone diagram sorts possible causes into various categories that branch off from the original problem. a fishbone diagram may have multiple sub-causes branching off of each identified category.
The 5 Whys
the 5 whys are a series of questions to drill down into successive layers of a problem. e.g. how did you break your shins? were you wearing shin pads? was anyone else around who saw the injury happen? were you paying attention to your surroundings? did you see what or who broke your shins or did it happen out of no where?
Pareto Chart
a Pareto chart is a histogram or bar chart combined with a line graph that groups the frequency or cost of different problems to show their relative significance. the bar shows the frequency in descending order, while the line shows cumulative percentage or total as you move from left to right.
what is the purpose of a fishbone diagram?
provides help in planning to identify possible causes of a problem in sorting ideas into useful categories. also includes benefits such as:
easy visualization
identify bottlenecks effortlessly
find opportunities for improvement
improve everyone's understanding
how do you create a fishbone diagram?
write the categories of causes as branches from the main arrow
plan all the possible causes of the problem
plan the major categories of causes of the problem
ask again "why does this happen?"
agree on a problem