Steve Reeves

Abstract State Machines, Alloy, B, VDM, and Z

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CONFLICTS AND FAIR TESTING

This paper studies conflicts from a process-algebraic point of view and shows how they are related to the testing theory of fair testing. Conflicts have been introduced in the context of discrete event systems, where two concurrent systems are said to be in conflict if they can get trapped in a situation where they are waiting or running endlessly, forever unable to complete their common task. In order to analyse complex discrete event systems, conflict-preserving notions of refinement and equivalence are needed. This paper characterises an appropriate refinement, called the conflict preorder, and provides a denotational semantics for it. Its relationship to other known process preorders is explored, and it is shown to generalise the fair testing preorder in process-algebra for reasoning about conflicts in discrete event systems.

A survey of software development practices in the New Zealand software industry

We report on the software development techniques used in the New Zealand software industry, paying particular attention to requirements gathering. We surveyed a selection of software companies with a general questionnaire and then conducted in-depth interviews with four companies. Our results show a wide variety in the kinds of companies undertaking software development, employing a wide range of software development techniques. Although our data are not sufficiently detailed to draw statistically significant conclusions, it appears that larger software development groups typically have more well-defined software development processes, spend proportionally more time on requirements gathering, and follow more rigorous testing regimes.

Formal models for user interface design artefacts

There are many different ways of building software applications and of tackling the problems of understanding the system to be built, designing that system and finally implementing the design. One approach is to use formal methods, which we can generalise as meaning we follow a process which uses some formal language to specify the behaviour of the intended system, techniques such as theorem proving or model-checking to ensure the specification is valid (i.e., meets the requirements and has been shown, perhaps by proof or other means of inspection, to have the properties the client requires of it) and a refinement process to transform the specification into an implementation. Conversely, the approach we take may be less structured and rely on informal techniques. The design stage may involve jotting down ideas on paper, brainstorming with users etc. We may use prototyping to transform these ideas into working software and get users to test the implementation to find problems. Formal methods have been shown to be beneficial in describing the functionality of systems, what we may call application logic, and underlying system behaviour. Informal techniques, however, have also been shown to be useful in the design of the user interface to systems. Given that both styles of development are beneficial to different parts of the system we would like to be able to use both approaches in one integrated software development process. Their differences, however, make this a challenging objective. In this paper we describe models and techniques which allow us to incorporate informal design artefacts into a formal software development process.

Formal Models for Informal GUI Designs

Many different methods exist for the design and implementation of software systems. These methods may be fully formal, such as the use of formal specification languages and refinement processes, or they may be totally informal, such as jotting design ideas down on paper prior to coding, or they may be somewhere in between these two extremes. Formal methods are naturally suited to underlying system behaviour while user-centred approaches to user interface design fit comfortably with more informal approaches. The challenge is to find ways of integrating user-centred design methods with formal methods so that the benefits of both are fully realised. This paper presents a way of capturing the intentions behind informal design artefacts within a formal environment and then shows several applications of this approach.

An analysis of total correctness refinement models for partial relation semantics I

This is the first of a series of papers devoted to the thorough investigation of (total correctness) refinement based on an underlying partial relational model. In this paper we restrict attention to operation refinement. We explore four theories of refinement based on an underlying partial relation model for specifications, and we show that they are all equivalent. This, in particular, sheds some light on the relational completion operator (lifted-totalisation) due to Woodcock which underlies data refinement in, for example, the specification language Z. It further leads to two simple alternative models which are also equivalent to the others.

Modelling safety properties of interactive medical systems

Formally modelling the software functionality and interactivity of safety-critical devices allows us to prove properties about their behaviours and be certain that they will respond to user interaction correctly. In domains such as medical environments, where many different devices may be used, it is equally important to ensure that all devices used adhere to a set of safety, and other, principles designed for that environment. In this paper we look at modelling important properties of interactive medical devices including safety considerations mandated by their users. We use ProZ for model checking to ensure that properties stated in temporal logic hold, and also to check invariants. In this way we gain confidence that important properties do hold of the device, and that models of particular devices adhere to the properties described.

Modular Synthesis of Discrete Controllers

This paper presents supervisory control theory in a process-algebraic setting, and proposes a way of synthesising modular supervisors that guarantee nonblocking. The framework used includes the possibility of hiding actions which results in nondeterminism. As modularity crucially depends on the process equivalence used, the paper studies possible equivalences and points out that, in order to be consistent with respect to the nonblocking property and to supervisor synthesis, a conflict-preserving equivalence must be used. It applies the results to synthesise nonblocking modular supervisors for a manufacturing system.

Formal refinement of informal GUI design artefacts

Before we build any piece of software we would, surely, need to be certain that what we intend to build is what is required by the users of that software. In addition, we would want to be sure that the proposed software will behave as expected, do the right thing under all circumstances and also be usable. These functional and usability requirements are often considered separately. The functional requirements may be considered by way of formal specifications or models which are then subjected to verification and validation to ensure that the required properties hold. Similarly, the usability and user requirements may be captured using task analysis methods and checked by design methods such as GOMS, scenario development and usability testing of incremental prototypes. This paper looks at one way of bringing these two processes together by including the graphical user interface (GUI) design process and design concerns in the formal process of specification and refinement. In particular it considers what it means for a prototype of a GUI to be considered as a formal refinement of a specification. In this paper we show how we can consider the visual display, or presentation, of the GUI as the refinement, rather than the code which produces that presentation, and how this allows us to apply standard and well-known refinement techniques to informal design artefacts

Fair testing revisited: A process-algebraic characterisation of conflicts

This paper studies conflicts from a process-algebraic point of view and shows how they are related to the testing theory of fair testing. Conflicts have been introduced in the context of discrete event systems, where two concurrent systems are said to be in conflict if they can get trapped in a situation where they are waiting or running endlessly, forever unable to complete their common task. In order to analyse complex discrete event systems, conflict-preserving notions of refinement and equivalence are needed. This paper characterises an appropriate refinement, called the conflict preorder, and provides a denotational semantics for it. Its relationship to other known process preorders is explored, and it is shown to generalise the fair testing preorder in process-algebra for reasoning about conflicts in discrete event systems.