A Method for Capturing and Reconciling Stakeholder Intentions Based on the Formal Concept Analysis - Intentional Perspectives on Information Systems Engineering - page 159

5.3 Extraction of the Goals and Sub-Goals Elicited

5.3.1 Extraction of Goals

Goal extraction is to eliminate the exceptional goals elicited from stakeholders and
extract the goals of certain level of importance. The goal extraction method consists
of the following procedures with goal preference table exemplified in Table 3. Here,
we assume a set of goals, A, B, C,

, elicited from 10 people in a stakeholder group.
Evaluate Goal Preference . We assume that the members of each stakeholder
group grade their preference to the goals; 3 for the most preferred, 2 for second,
and 1 for third, and 0 for no-preference in the previous goal elicitation process.
For each goal, calculate Goal Preference Ratio (Pg), the preference order of
goals within a stakeholder group .

...

Ta b l e 3 Goal preference table

Number of preferring stakeholder

Goal Most (3) 2nd (2) 3rd (1) Total score Pg (%)

A 6 2 2 24 80( = 24/30)

B 0 1 0 2 7( = 2/30)

C 2 5 1 17 57( = 17/30)

D 1 0 2 5 17( = 5/30)

Definition 4: Pg: Goal Preference Ratio of Goal X

i Preference Score of a Goal X ∗ Number of Member of Stakeholder Group i
(Max. Score of Preference ∗ Total Number of Member in the Stakeholder Group i )

Pg = (2)

As indicated in Table 3, we count the number of members within the stakeholder
group scoring 3 (most), 2 (second), and third (1) to each goal. By summing up the
score multiplied with number of people who graded the score, we calculate a total
score; 24 for goal A. Dividing by the max. score of preference 30 (

3 ∗ 10), we can =

calculate the Pg; 80% for goal A.
Extract the Significant Goals Based on Pg . To extract the goal, we need to set
the level of significance as the threshold of Pg. From our experience, we set 10% as
the threshold of Pg in this chapter. In Table 3, we can eliminate goal B and extract
goal A, C and D. The results indicate that 10% of threshold is low enough to extract
enough goals, but high enough to eliminate exceptional goals.

5.3.2 Extraction of Sub-Goals

The next step is to extract sub-goals with the sub-goal preference table exemplified
in Table 4 through the following process.
Identify the Dependency from Sub-Goals to Goals . With the subconcept-
subconcept order relation of FCA, we can identify the dependency from a sub-goal