纳入集中采购目录属于通用的政府采购项目的，应当委托集中采购机构代理采购；属于本部门、本系统有特殊要求的项目，应当实行部门集中采购；属于本单位有特殊要求的项目，经(17)批准，可以自行采购。

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Due to a constantly(71)environment, a poor understanding of the user's needs and preferences, as well as a(72)of willingness to modify(73)organizational structures and decision models, the full economic potential of Web.

 Information Systems(WIS)has not been realized by now. The data object types of the(74)meta. model, the Extended World Wide Web Design Technique(EW3DT), provide hypertext designers(75)a conceptual, user-centric framework and graphical notation for the construction of both, reference and customized models, during the software development process of commercial WIS. A reference model as a normative concept represents an abstraction of a typical company, its functional units, or its(Web)Information Systems and is intended to streamline the design and implementation of complex applications at reduced costs. As precondition for pursuing a partial globalization strategy, EW3DT distinguishes between technical and content-specific responsibilities for designing, implementing, and maintaining WIS.

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