Build the PRT
When
building a PRT start at the top of the tree with the injection you want to
accomplish. The injection becomes the objective of the PRT. The Objective and IO’s are in square cornered
boxes and the obstacles are in round cornered boxes. This is strictly a symbol to separate the two
thoughts when looking at the tree in addition to the box titles.
As a
beginning point, look at your list of IO’s and determine if you can find two of
them that are connected. In other words,
is there one IO that must exist before another IO can exist? When you look at the IO’s ask yourself, “What
must happen just before this IO can exist?”
If the answer is an IO on the list then, we can make the connection with
a necessity arrow. If a plausible IO
does not exist then, determine what the new IO would be and write it down. Let’s make a connection from the Dome Company
list.
It
is not necessary to connect to the objective first. It is possible that the first connection
could come from two independent IO’s.
So, if we read this out loud; “In order to have Production synchronized
to maximize throughput, I must have scheduling changed to a “pull” system,
because Current scheduling is a push system.”
With this connection you’ll notice that IO-1
is connected to OBS-1 by the necessity arrow.
All of the IO’s will always be paired with the corresponding obstacle. At this point you can ask, “Is there anything
else required to be in place just before the objective?” Or, we could also ask, “What entity must
exist just before IO-1 can be achieved?”
Is there another IO on our list that must happen before we can change
scheduling to a “Pull” system? Let’s keep building and make the connections
some additional connections.
In
our next posting we will complete our Prerequisite Tree (PRT) before moving on
to our next TOC Thinking Process tool.
Bob
Sproull
3 comments:
Hi,
i guess that the fact that OBS-5 and OBS-7 are the same is a "copy-paste" error :)
or can it be that a same obstacle can be used twice (or more) ?
Regards,
You are correct Guillaume, it is a typo. The same obstacle can be used multiple times, but in this case it was a typo.
Bob
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