Sensitivity Analysis of the i* Optimisation Model

Abstract

Abstract:Requirement elicitation is an important activity in early requirement engineering. Several wellknown approaches and goal models have been developed to deal with requirement elicitation. The i* goal model is used to represent the socio-technical domains and can be used for analysis in early requirement analysis. The elicitation process is complicated by the incomplete and imprecise input data available for analysis. Imprecise and unavailable data can be captured by fuzzy logic and then it can be managed by the popular operation research techniques known as optimisation. This paper presents a formal multiobjective optimisation model, for the i* framework, with regard to requirement elicitation. The optimisation model has the capacity to handle large and complex systems. The optimisation model has been expanded to include sensitivity analysis, in order to facilitate useful information on input data for the requirement analyst. The proposed approach is explained using the London Ambulance System case study and is evaluated using a simulation based analysis.

Specifying and reasoning about contextual preferences in the goal-oriented requirements modelling

“…The work in [24] quantitatively measures the impact of alternative solutions on the degree of satisfaction of softgoals. Evaluating such impacts is used in the selection of a most preferred alternative.…”

“…With the potentially large space of candidate solutions to the requirements problem, stakeholder preferences have been used as criteria for comparison. There are two main types of preference specification: the qualitative specification, such as in [22], [11], [21], and [7]; and the quantitative specification, as like in [24], [16], and [20]. We first look at the qualitative ones.…”

“…Alternatively, the quantitative preference specifications are more elaborate by using numerical weights. The work in [24] quantitatively measures the impact of alternative solutions on the degree of satisfaction of softgoals. Evaluating such impacts is used in the selection of a most preferred alternative.…”