After a period where implementation speed was more important than integration, consistency and reduction of complexity, architectural considerations have become a key issue of information management in recent years again. Enterprise architecture is widely accepted as an essential mechanism for ensuring agility and consistency, compliance and efficiency. Although standards like TOGAF and FEAF have developed, however, there is no common agreement on which architecture layers, which artifact types and which dependencies constitute the essence of enterprise architecture. This paper contributes to the identification of essential elements of enterprise architecture by (1) specifying enterprise architecture as a hierarchical, multilevel system comprising aggregation hierarchies, architecture layers and views, (2) discussing enterprise architecture frameworks with regard to essential elements, (3) proposing interfacing requirements of enterprise architecture with other architecture models and (4) matching these findings with current enterprise architecture practice in several large companies. Keywords enterprise architecture, architectural components, architectural layers, architectural views, interfaces The components of an EA framework should be applicable for a broad range of corporations and government agencies. Traditionally, architecture in the information systems context is focusing on IT related artifacts like IT platforms, software components and services, applications, IT processes, and maybe IT strategy in order to support more efficient IT operations, better return on IT investment, and faster, simpler and cheaper IT procurement (Opengroup 2003). In contrast to this approach which better should be designated information systems architecture (ISA), EA should also include business related artifacts like organizational goals, products and services, markets,

The American College of Surgeons Committee on Trauma's Advanced Trauma Life Support Course is currently taught in 50 countries. The 8th edition has been revised following broad input by the International ATLS subcommittee. Graded levels of evidence were used to evaluate and approve changes to the course content. New materials related to principles of disaster management have been added. ATLS is a common language teaching one safe way of initial trauma assessment and management.

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Information requirements analysis for data warehouse systems differs significantly from requirements analysis for conventional information systems. Existing data warehouse specific approaches are reviewed. A comprehensive methodology that supports the entire process of determining information requirements of data warehouse users, matching information requirements with actual information supply, evaluating and homogenizing resulting information requirements, establishing priorities for unsatisfied information requirements, and formally specifying the results as a basis for subsequent phases of the data warehouse development (sub)project is proposed Its components as well as its overall design are based partially on literature review, but mainly on findings from a four year collaboration project with several large companies, mostly from the service sector. While an application of the entire methodology is still outstanding, some components have been successfully applied in actual data warehouse development projects of the participating companies.