The magnetic susceptibility, X, at 295 K of a wide variety of common laboratory construction materials has been carefully measured. Only materials with well-characterized compositions are included in the final data. Materials such as eu alloys and fined epoxies showing ferromagneticlike saturation behavior are listed with the recognition that workers will probably want to use these with great caution in precision experiments where magnetic effects may be a source of error. Susceptibility values are given for over 30 materials for which X values are not available in the literature and which exhibit X independent of H.

Collecting and organizing all of the architectural information for a system is a challenge faced by information technology (IT) architects. Transforming that information into models of a viable architecture and keeping associated work products consistent and up to date is an even greater challenge. Despite this, model-centric architectural methods are not as widely adopted or as closely followed as they could be, partly due to a lack of appropriate tools. The Architects' Workbench (AWB) is a prototype tool that addresses these problems and supports the creative process of architectural thinking and modeling. This paper presents key AWB innovations and discusses how their design was motivated by insights into architectural work and feedback from IT architects. We describe the design of AWB itself as a metamodel-driven and methodbased tool, and we report on experience from the use of AWB in production environments.

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