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Ta b l e 4
Sub-goal preference (Ps)
Sub-Goals
Goal
Preference
1
2
3
4
A
Number of stakeholders
9
5
1
7
Preference Ratio (%)
90
50
10
70
C
Number of stakeholders
2
1
6
0
Preference Ratio (%)
25
13
75
0
D
Number of stakeholders
2
0
1
0
Preference ratio (%)
67
0
34
0
to a goal in terms of the preference of stakeholders. Looking at Table
4,
the upper
row in each stakeholder indicates the number of people who prefer the goal, say A,
and sub-goal 1, 2, 3,
...
. For example, 9 people prefer sub-goal 1 while they also
prefer goal A.
Evaluate the Dependency from Sub-Goal to Goal
. We can calculate the prefer-
ence ratio of a sub-goal Y to goal X by the following definition.
Definition 5: Ps: Sub-Goal Preference Ratio
(Number of Stakeholders Selecting the Sub-Goal Y of Goal X)
(Number of Stakeholders Selecting Goal X)
Ps
=
(3)
Looking at goal A in Table
4,
the preference to goal A is 90% from sub-goal 1,
and 50% from sub-goal 2. On the other hand, it is 10% from sub-goal 3.
Extract Significant Sub-Goals
. Similar to the goal extraction, low preference
means that the sub-goal is little related to the goal in order to avoid unnecessary
complexity among goals and sub-goals. Again, we set 10% as the threshold of Ps in
this chapter. In Table
4,
the preference of sub-goal 1 to goal A, sub-goal 2 to goal
D, and sub-goal 4 to goal D are eliminated.
5.4 Structuring Goals and Sub-Goals by Goal Lattice
Structuring goals and sub-goals is to find the ordered relationships among goals
and sub-goals to the set of stakeholders. First, we can find unordered relationships
among goals and sub-goals by
goal matrix
. Then, we employ
goal lattice
to order
the relationships among goals, sub-goals and stakeholders.
Definition 6: Goal Matrix
A goal matrix is a matrix with a set of goals in the row, and a set of sub-goals
and a set of stakeholders in the column.
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