Owen Traynor

Possum: an animator for the SUM specification language

We present an overview of the Possum specification animation system, an addition to the Cogito methodology and toolset. Possum allows interpretation (or animation) of specifications written in SUM, which is the specification language used in Cogito. We give an account of the functionality of Possum, illustrated by some simple examples, and describe the way in which Possum is used in a typical Cogito development. The current capabilities and limitations of Possum are reviewed from a technical perspective and an overview of other systems that support the animation of formal specification languages is presented.

A generic model for fine grained configuration management including version control and traceability

This paper describes the implementation of a prototype system that supports fine-grained configuration and version management. The development has been undertaken in the context of providing trusted support for high-integrity software development. The starting point of this paper is a formal specification of the consistency and completeness criteria that our system must meet. The main issues are illustrated using a simple example: a system which supports the evolution of requirements and design documents and maintains the relationships between these two artifacts. The prototype was developed using a sophisticated object-oriented database system. Finally we draw conclusions about the integration of fine-grained configuration and version management facilities into a single framework.

Requirements engineering and verification using specification animation

Presents an overview of the Possum specification animation system and its integration into the Cogito methodology and toolset. Possum allows interpretation (or animation) of specifications written in Sum, the specification language of Cogito. We distinguish two potential uses for Possum and illustrate each of these with an example. The first is the use of Possum for specification verification, where the analysis of properties of specifications by the specification designer is emphasised. The second use is specification validation, where the specification is checked against the informal requirements of the system.

COGITO: A METHODOLOGY AND SYSTEM FOR FORMAL SOFTWARE DEVELOPMENT

Cogito 1 is the first iteration of a Z-based integrated methodology and support system for formal software development. This paper gives an overview of the Cogito methodology and associated tools. Particular emphasis is placed on the way in which Cogito integrates the various phases of the formal development process and provides comprehensive tools support for all phases of development addressed by the methodology.

Supporting Fine-Grained Traceability in Software Development Environments

This paper describes the facilities currently available to support auditing and traceability within a system which provides fine-grained configuration and version management. We contend that the relationship between the configuration management system and the underlying version control system is a critical factor which governs many aspects of the facilities supporting traceability. The model of traceability is formally specified relative to our configuration and versioning models.

Formal methods pilot project

Reports on a collaborative project to pilot the use of formal methods in the development of safety-related software. Using the SVRCs Cogito methodology, staff from CSC Australia undertook: formal specification; validation of the specification by mathematical consistency checks; hazard analysis; and validation of the specification against the safety requirements. Part of the design was modelled formally and verified.

The Cogito Repository Manager

This paper describes the Cogito Repository Manager. The motivation behind, and structure of, the repository manager are presented in detail. Issues surrounding version and configuration management are also discussed. The way in which process modeling, configuration and version control, and tool integration are combined into a single framework is outlined. An example population which instantiates the system with a C development environment is given. The development has been undertaken, in the context of an integrated system and methodology for the formal construction of programs (Cogito). The repository manager described here forms the central components of the Cogito system.<<ETX>>

The Cogito methodology and system

Cogito I is the first iteration of a Z-based integrated development methodology and support system for formal software development. This paper gives an overview of the Cogito methodology and associated tools. Particular emphasis is placed on the way in which Cogito integrates the various phases of the formal development process and provides comprehensive tool support for all phases of development addressed by the methodology.<<ETX>>

The Cogito Development System

The Cogito system provides comprehensive support for the development of specifications written in the Sum language (a modular extension of Z). The tool-set provides technology to aid in the construction, analysis and development of Sum specifications. Ada code is the final result of a development in Cogito.