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Computer Science

35. Improving Activity Diagramming with UML 2.0

Profile image of Delvin GrantDelvin Grant

2010

Abstract

This paper identifies four problems with UML activity diagramming that have implications for teaching and practice. Solutions to each of the four problems are provided. The proposed solutions are borrowed from existing modeling paradigms, specifically structured systems analysis and design methods (SSAD). We did not see the need to reinvent solutions when adequate remedies exist. The proposed solutions help to improve the syntax, semantics, and consistency of activity diagramming in UML.

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petia wohed

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The Unified Modelling Language (UML) is a well-known family of notations for software modelling. Recently, a new version of UML has been released. In this paper we examine the Activity Diagrams notation of this latest version of UML in terms of a collection of patterns developed for assessing control flow and data flow capabilities of languages used in the area of process-aware information systems. The purpose of this analysis is to assess relative strengths and weaknesses of control and data flow specification in Activity Diagrams and to identify ways of addressing potential deficiencies. In addition, the pattern-based analysis will yield typical solutions to practical process modelling problems and expose some of the ambiguities in the current UML 2.0 draft specification .

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What Are the Used UML Diagram Constructs? A Document and Tool Analysis Study Covering Activity and Use Case Diagrams
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UML offers a very large set of constructs for each of its diagram types, however many of them seem scarcely used or even their existence is not known. Here, we decided to present a precise view of the usage levels of the constructs of activity and use case diagrams by means of a document and tool analysis study, covering preliminarily: books, courses, tutorials, and tools about UML. Results of the study show that, among the 47 activity diagrams constructs, a large majority of them seem to be scarcely used, while, only nine result widely used, whereas only two of the nine constructs of the use case diagrams seem scarcely used. This work is part of a larger project aimed at investigating the usage level of the UML diagrams and their constructs, also by means of a personal opinion survey intended for UML users.

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UML is posited as the "swiss army knife" for systems modelling and design activities. It embodies a number of modelling formalisms that have broad applicability in capturing both the static and dynamic aspects of software systems. One area of UML that has received particular attention is that of Activity Diagrams (ADs), which provide a high-level means of modelling dynamic system behaviour. In this paper we examine the suitability of UML 2.0 Activity Diagrams for business process modelling, using the Workflow Patterns as an evaluation framework. The Workflow Patterns are a collection of patterns developed for assessing control-flow, data and resource capabilities in the area of Process Aware Information Systems (PAIS). In doing so, we provide a comprehensive evaluation of the capabilities of UML 2.0 ADs, and their strengths and weaknesses when utilised for business process modelling.

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