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hello there welcome back in this section
we will start discussing
root cause analysis tools and the first
tool is
why why analysis five wise
or yy analysis is an iterative
and interrogative technique used to
explore the cause and effect relationship
relationship
underlying a particular problem
iterative meaning repeated way
of doing it interrogative meaning on a
questioning manner
or technique now its primary goal is to
establish the root cause
of an effect by repeating the question
why each answer becomes the basis of the
next question
now the technique is developed by
sakichi toyoda
and was used within toyota as a rule of thumb
thumb
we asked five wise with the belief that
on the fifth y we can find
the potential root cause but it's just a
rule of thumb
we can ask more than five y's or we can ask
ask
less than five y's so it really depends
on the complexity of the problem
and the context that is being put into
the practice of five wise
now let's take some examples example
number one
problem statement is that the vehicle
will not start
always remember that the top of the
y-way analysis
is always your problem statement that
you have written in your defined phase
for this case let's take the vehicle
will not start
why because the battery is dead
why because the alternator is not functioning
functioning
why because the alternator belt has broken
broken
and why the alternator belt was well
beyond its useful service life
and not replaced and why the vehicle was
not maintained according to the
recommended service schedule
as you can see coming from the problem
statement that the vehicle will not start
start
we found out that it's because of poor
maintenance schedule
and attainment now we can set this aside
and we can validate this
moving forward we cannot say that this
is valid already because we haven't used
data yet
next example we have wrong
item shipped to customer why
the wrong item was pulled out from inventory
inventory
and why the item we pulled from
inventory was mislabeled
and why our supplier mislabeled the item
prior to shipping it to
our warehouse and why the individual
applying labels to our product at the supplier
supplier
place the wrong label on the product and why
why
labels for different orders are
pre-printed and it's easy
to apply the wrong label so as you can
see coming from the wrong
item shipped to the customer we have it
two labels for different orders are pre-printed
pre-printed
and it is easy to apply the wrong label
so this will
be set aside again and we can collect
data in order to prove that is valid or not
not
valid third example team missed
deadline for running executive reports
why no one was on site to run the reports
reports
why person who regularly runs reports
was on vacation so no one
was on site to do the job why no backup
in place for that activity
why no one identified as backup to run reports
reports
so again coming from team missing the deadline
deadline
for running executive reports we boil
down to
no one identified as the backup to run
the reports
now some y analysis could look like this
and some could look like something like this
this
this is happening because we have
several sub reasons on each
of the last answer to our y now it
creates more than one path that is why
you are seeing
more of a three diagram approach now on
top of the thing that i presented
earlier you can actually do what we call
the tree diagram approach similar to
this one
now this is how we do the yy analysis
now this is the step-by-step approach on
how to do it
first you have to form the team
basically this team if you're doing your
lean six sigma project it's your
team already number two you have to
define the problem
as early as define phase we have already
defined our problem
three ask why this is the yui
activity proper or the root cause
analysis proper
four validate don't jump into the
conclusion that your last answer to the
last y
is valid use data to validate it
and fifth one take action once you know
that it is valid
so you have to take action now in this
particular activity
what we can practice mainly two and
three because 4
will be second phase of analyze phase
and 5
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