The University of Southampton
University of Southampton Institutional Repository
Warning ePrints Soton is experiencing an issue with some file downloads not being available. We are working hard to fix this. Please bear with us.

Retrenching partial requirements into system definitions: A simple feature interaction case study

Retrenching partial requirements into system definitions: A simple feature interaction case study
Retrenching partial requirements into system definitions: A simple feature interaction case study
In conventional model-oriented formal refinement, the abstract model is supposed to capture all the properties of interest in the system, in an as-clutter-free-as-possible manner. Subsequently, the refinement process guides development inexorably towards a faithful implementation. However refinement says nothing about how to obtain the abstract model in the first place. In reality, developers experiment with prototype models and their refinements until a workable arrangement is discovered. Retrenchment is a formal technique intended to capture some of the informal approach to a refinable abstract model in a formal manner that will integrate with refinement. This is in order that the benefits of a formal approach can migrate further up the development hierarchy. The basic ideas of retrenchment are presented, and a simple telephone system feature interaction case study is elaborated. This illustrates not only how retrenchment can relate incompatible and partial models to a more definitive consolidated model during the development of the contracted specification, but also that the same formalism is applicable in a reengineering context, where the subsequent evolution of a system may be partly incompatible with earlier design decisions. The case study illustrates how the natural method of composing retrenchments can give results that are too liberal in certain cases, and stronger laws of composition are derived for systems possessing suitable properties. It is shown that the methodology can encompass more ad hoc and custom built techniques such as Zave’s layered feature engineering approach to applications exhibiting a feature oriented architecture (such as telephony).
feature interaction, formal methods, refinement, requirements engineering, retrenchment
0947-3602
266-288
Banach, Richard
3c9a2946-4d86-428e-bce2-6dfdde219ff3
Poppleton, Michael
4c60e63f-188c-4636-98b9-de8a42789b1b
Loucopoulos, Peri
1f9eec07-ddb9-4064-a524-1c4659ea3e4a
Mylopoulos, John
640f32e9-89c3-4520-9f43-f13fd82a03c8
Banach, Richard
3c9a2946-4d86-428e-bce2-6dfdde219ff3
Poppleton, Michael
4c60e63f-188c-4636-98b9-de8a42789b1b
Loucopoulos, Peri
1f9eec07-ddb9-4064-a524-1c4659ea3e4a
Mylopoulos, John
640f32e9-89c3-4520-9f43-f13fd82a03c8

Banach, Richard and Poppleton, Michael , Loucopoulos, Peri and Mylopoulos, John (eds.) (2003) Retrenching partial requirements into system definitions: A simple feature interaction case study. Requirements Engineering Journal, 8 (4), 266-288.

Record type: Article

Abstract

In conventional model-oriented formal refinement, the abstract model is supposed to capture all the properties of interest in the system, in an as-clutter-free-as-possible manner. Subsequently, the refinement process guides development inexorably towards a faithful implementation. However refinement says nothing about how to obtain the abstract model in the first place. In reality, developers experiment with prototype models and their refinements until a workable arrangement is discovered. Retrenchment is a formal technique intended to capture some of the informal approach to a refinable abstract model in a formal manner that will integrate with refinement. This is in order that the benefits of a formal approach can migrate further up the development hierarchy. The basic ideas of retrenchment are presented, and a simple telephone system feature interaction case study is elaborated. This illustrates not only how retrenchment can relate incompatible and partial models to a more definitive consolidated model during the development of the contracted specification, but also that the same formalism is applicable in a reengineering context, where the subsequent evolution of a system may be partly incompatible with earlier design decisions. The case study illustrates how the natural method of composing retrenchments can give results that are too liberal in certain cases, and stronger laws of composition are derived for systems possessing suitable properties. It is shown that the methodology can encompass more ad hoc and custom built techniques such as Zave’s layered feature engineering approach to applications exhibiting a feature oriented architecture (such as telephony).

Text
Retrench.Partial.Req.pdf - Other
Download (201kB)

More information

Published date: November 2003
Keywords: feature interaction, formal methods, refinement, requirements engineering, retrenchment

Identifiers

Local EPrints ID: 258007
URI: http://eprints.soton.ac.uk/id/eprint/258007
ISSN: 0947-3602
PURE UUID: 37850636-c300-44ee-ac6b-73f868d9e15f

Catalogue record

Date deposited: 17 Jul 2003
Last modified: 20 Nov 2021 05:40

Export record

Contributors

Author: Richard Banach
Author: Michael Poppleton
Editor: Peri Loucopoulos
Editor: John Mylopoulos

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×