Page 112 - Six Sigma Advanced Tools for Black Belts and Master Black Belts

OTE/SPH
OTE/SPH
August 31, 2006
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Future Reality Tree (FRT) 97
W3. User
W1a. User W1b. User wasted time
feels wastes time going through all
frustrated waiting
the options

N1. Operators N2. User wastes N3. Most of the
cannot cope time going time still need to
with the number through all the speak to the
of calls options operator
Figure 8.3 Undesirable effects and CRT entities.

Now identify root causes for the UDEs and number the entities for easy reference
(Figure 8.7). Typically, entities with no arrows going into them are root causes. Try to
follow some standard rules for the numbering, especially if the CRT extends beyond
one page. For example, the first page might start at 100, the second at 200, and so on.
At this point the CRT is complete. All the possible root causes have been identified.
Note that you do not have to solve all the root causes to remove the UDEs. The next
step is to construct an FRT to identify and evaluate the possible solutions.

8.3 FUTURE REALITY TREE (FRT)

The FRT is a tool for revealing how changing the current status can affect the future
‘reality’. It is most commonly used to identify solutions (injections in TOC terminology)
to problems identified during the construction of a CRT. It also allows evaluation of
the injections before resources are committed to them. In this section, we show how
to construct an FRT based on the example from the previous section.
The first step is to identify the desirable effects. This is typically done by stating the
opposite of the UDEs from the CRT (Figure 8.8).
The second step is to list the possible injections for the root causes (Figure 8.9).

W1a. User W1b. User
feels wastes time
frustrated waiting

N1. Operators N2. User N3. Most of the
cannot cope wastes time time still need to
with the number going through all speak to the
of calls the options operator

Figure 8.4 Rearrangement of CRT to remove redundancy.