A Conceptual Modelling Framework for DEDS

Abstract

The focus of this chapter is on conceptual modelling within the DEDS domain. Following a brief overview of the nature of the conceptual modelling task, a perspective of the behaviour of shoppers within a department store context is presented. Embedded in this perspective are some essential elements of an innovative conceptual modelling framework developed by the authors. The presentation of this framework [called the ABCmod conceptual modelling framework (Activity Based Conceptual modelling)] is the main topic of this chapter. The underlying conceptual modelling objective is the characterization of behaviour (namely the behaviour of the SUI) in a way that is consistent with the goal of the study. Behaviour, in turn, can be regarded as the consequence of the interactions, over time, among a collection of entities (the surrogates for the objects that populate the SUI). Two requirements therefore emerge; namely, a means for characterizing the entities and a means for characterizing the interactions. These dual requirements are handled in ABCmod via the notions of entity categories and behavioural artefacts respectively. As its name suggests the main behavioural artefact in the ABCmod framework is the activity. The activity is an encapsulation of a specific unit of behaviour that can be identified within the SUI and which has relevance to the model building task. Following the introduction of the underlying basis of the ABCmod framework, the various details of its constituents are presented. The development of an ABCmod conceptual model in terms of “model structure” and “model behaviour” is outlined. To accommodate the complexity that can unfold in the development of any conceptual model, a two level approach is adopted in the ABCmod framework. The high level initial stage is unencumbered by excessive detail and intended as a discussion vehicle among all project stakeholders while a detailed level provides the specifications required by the simulation modelling team. The essential features of both of these views are outlined. The Chapter concludes with a preview of several example projects that illustrate the ABCmod conceptual modelling approach. Details of these are provided in Annex 1.