ISSN:1350-1917    

DOI:10.1111/j.1365-2575.1994.tb00049.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Abstract.This paper examines critically the function point analysis mark II (FPA mark II) method of measuring the functionality of information systems. Although the focus of the paper is on FPA mark II as devised by Symons, both this and the Albrecht method, from which the FPA mark II was developed, are briefly discussed. The published attempts to validate FPA mark II are reviewed and then the problems encountered by the author in applying the approach are described. The final part of the paper is concerned with the fit between SSADM and FPA mark II.

ISSN:1350-1917    

DOI:10.1111/j.1365-2575.1994.tb00050.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Abstract.An empirical investigation into the validation process within requirements determination is described in which systems analysts were asked to complete a questionnaire concerning important validation issues. We describe the major validation activities, a set of major problems experienced by the respondents, factors affecting the process and hypotheses for problem explanations. The levels of experience of the respondents and the organizations for which they work appear to be significant.Analysts employ a very traditional approach, expressing the specification mainly in English, and they experience problems in using over‐formal notations in informal situations with users, as well as problems in deriving full benefit from notations when building the specification and detecting its properties. Not all of the specification is validated and tool use is not widespread and does not appear to be effective.We define the concepts of formal and informal view, and suggest that method and tool use will not necessarily increase in organizations as it is apparent that research into the more effective application of formal notations is necessary. In addition, it is clear that the factors that affect the validation process are not only technical, but individual and organizational, necessitating the development of suitable informal activities which take these factors into accoun

ISSN:1350-1917    

DOI:10.1111/j.1365-2575.1994.tb00051.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Abstract.To meet the demands of organizations and their ever‐changing environment, information systems are required which are able to evolve to the same extent as organizations do. Such a system has to support changes in all time‐and application‐dependent aspects. In this paper, requirements and a conceptual framework for evolving information systems are presented. This framework includes an architecture for such systems and a revision of the traditional notion of update. Based on this evolutionary notion of update (recording, correction and forgetting) a state transition‐oriented model on three levels of abstraction (event level, recording level, correction level) is introduced. Examples are provided to illustrate the conceptual framework for evolving information

ISSN:1350-1917    

DOI:10.1111/j.1365-2575.1994.tb00052.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY