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5.6 Analysis of the Structure of System Goal Lattice
System goal lattice represents the dependencies among goals, sub-goals and stake-
holders, and help to understand the structural properties of the systems. Thus, the
system goal lattice can be used for the following structural analyses:
1. Analyze the goals and sub-goals from a viewpoint of a specific stakeholder.
We can identify a set of goals preferred by a specific stakeholder and the
sub-goals fulfilling the goals, and high-lighten them on the system goal lattice.
2. Analyze the stakeholders from the viewpoint of a specific goal.
We can identify the stakeholders who prefer a specified goal or sub-goal, and
high-lighten them on the system goal lattice.
3. Analyze the commonality and variability of goals among stakeholders.
We can identify the commonality and variability of goals among stakeholders.
4. Analyze the fulfillment dependencies of goals among stakeholders.
We can identify a set of goals of a set of stakeholders and sub-goals fulfilling
the goals, and highlight them on the system goal lattice.
5.7 Method for Evaluating the Reconciliation of Goal Lattice
We defined the following two measures for evaluating the effectiveness of goal
reconciliation.
Rd: Goal Diversity Ratio
Definition 9: Rd: Goal Diversity Ratio
Goal Diversity Ratio, Rd, is a size measure of the span of goal lattice, which is
defined by (4).
(Number of entities in the Goal Lattice for a Stakeholder)
(Number of entities in the Goal Lattice for the Reference Stakeholder)
Rd
=
(4)
We can evaluate Rd for each stakeholder, that is, the diversity of the goals of
the stakeholder. The larger Rd is, the more diverse the goals of the stakeholder are.
Reference stakeholder can be any stakeholder who provides a reference view to
the system. In our case study discussed later, we select ourselves, developer, as the
reference stakeholder so that we measure the diversity of goals of each stakeholder
in comparison with our view to the system.
Rr: Goal Reduction Ratio
Definition 10: Rr: Goal Reduction Ratio
Goal Reduction Ratio, Rr, is a measure of the effectiveness of the reconciliation
of goals, which is defined by (5).
(Number of entities in the goal lattice after reconciliation)
(Number of entities in the goal lattice before reconciliation)
Rr
=
(5)
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