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Requirements engineering from an organisational perspective needs to be viewed as social engineering, Thus in this paper a modelling language will be presented, which is visual in nature, and with which we assert that it is possible to diagrammatically represent and reason about the impact that an information technology system may have on an organisation,(More)
Enterprise models, based on the responsibilities and relationships underlying market activities, are used to provide a framework for representing and analysing the activity of brokerage in network-based commerce. Examples of models are presented that represent new configurations of systems, services and processes. Three distinct phases of brokerage are(More)
The most crucial aspect sf sojiware engineering is the gathering of requirements. Increasing the unwunt of tinw and improving the quality of effort expended ut this stage will lead to fewer and more tnnnageahle prohlems later on in the development ltfe-cycle. The purpose of this paper is to highlight one of the most crucial prohlenis thmt aflict user(More)
An ideal solution model has been used to calculate the effect of the substitutions Fe J + _ ~ A1 and (Fe, Mn) ~ + . Al on the stability fields of the A12SiO 5 minerals. The results show that divariant assemblages of andalusite+sillimanite and sillimanite+kyanite solid solutions can coexist over ranges of 0-1 to 0.4 kbar at 527 ~ C, but that(More)
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