Jackson system development

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Abstract: This paper describes a formal method for specifying the observable (external) behavior of information systems using a process algebra and input-output traces. Its notation is mainly based on the entity concept, borrowed from the Jackson System Development method, and integrated with the requirements class diagram to represent data structures and associations. The specification process promotes modular and incremental description of the behavior of each entity through process abstraction, entity type patterns, and entity attribute function patterns. Valid system input traces result from the composition of entity traces by using parallel composition operations. The association between input traces and outputs through an input-output relation completes the specification process.

Abstract: The motivation for integrating human factors with structured systems analysis and design methods has been set out in earlier papers. In addition, a preliminary conception of such an integration has been proposed for the Jackson System Development method (referred to as JSD∗), and a set of requirements, research and strategies suggested for further developing this conception. The present paper reports the progress of the research, and presents an overview of the stage-wise design process, scope and notation of the JSD∗ method. The method is discussed and illustrated using a simple case-study concerning a Recreation Booking System.

Abstract: . This paper describes a proposed framework for linking soft systems methodology (SSM), a problem structuring technique for use in messy, ill-defined problem situations, with Jackson System Development (JSD), an information system development methodology which has object-oriented characteristics. The approach taken has been to embed the modelling phase of JSD within SSM after the conceptual modelling stage, but before the debate on desirable and feasible change. The JSD modelling phase is carried out at a conceptual rather than a real world level. The framework comprises of a series of steps which enable JSD entity structure diagrams to be derived to a large extent from the activities in an SSM conceptual model. A data model may then be built up by exploding the activities in the conceptual model or by using ‘conceptual hows’ to identify more entities and actions. One of the main benefits expected to arise from the use of such a framework is an improved user requirement definition, which is important to successful systems implementation. The difficulties in actually achieving a link relate to the methodological and philosophical differences between SSM and JSD.