【文章內(nèi)容簡介】 ine the scope of the database and the general content. This step usually occurs in an organization39。s information system planning process, it aims to help organizations create an overall data description or explanation, and not the design of a specific database. A specific database for one or more information systems provide data and the corporate data model (which may involve a number of databases) described by the organization maintaining the scope of the data. Data modeling in the enterprise, you review of the current system, the need to support analysis of the nature of the business areas, the need for further description of the abstract data, and planning one or more database development project. Figure 1 shows Pine Valley furniture pany39。s enterprise data model of a part. Information System Architecture As shown in figure 1, senior data model is only general information system architecture (ISA) or a part of an organization39。s information system blueprint. In the information system planning, you can build an enterprise data model as a whole information system architecture part. According to Zachman (1987), Sowa and Zachman (1992) views of an information system architecture consists of the following six key ponents: Data (Figure 1 shows, but there are other methods that). Manipulation of data processing (of a data flow diagram can be used, with the object model methods, or other symbols that). Networks, which organizations and in organizations with its main transmission of data between business partners (it can connect through the network topology map and to demonstrate). People who deal with the implementation of data and information and is the source and receiver (in the process model for the data shows that the sender and the receiver). Implementation of the events and time points (they can use state transition diagram and other means.) The reasons for the incident and data processing rules (often in the form of text display, but there are also a number of charts for the planning tools such as decision tables). Information Engineering Information systems planners in accordance with the specific information system planning methods developed information system architecture. Information engineering is a popular and formal methods. Information engineering is a dataoriented creation and maintenance of the information system. Information engineering is because the dataoriented, so when you begin to understand how the database is defined by the logo and when information engineering a concise explanation is very helpful. Information Engineering follow topdown planning approach, in which specific information systems from a wide range of information needs in the understanding derived from (for example, we need about customers, products, suppliers, sales and processing of the data center), rather than merging many detailed information requested ( orders such as a screen or in accordance with the importation of geographical sales summary report). Topdown planning will enable developers to plan more prehensive information system, consider system ponents provide an integrated approach to enhance the information system and the relationship between the business objectives of the understanding, deepen their understanding of information systems throughout the organization in understanding the impact. Information Engineering includes four steps: planning, analysis, design and implementation. The planning stage of project information generated information system architecture, including enterprise data model. Information System Planning Information systems planning objective is to enable IT organizations and the business strategy closely integrated, such integration for the information systems and technology to make the most of the investment interest is very important. As the table as a description, information engineering approach the planning stage include three steps, we in the followup of three sections they discussed. 1. Critical factors determining the planning Planning is the key factor that organizational objectives, critical success factors and problem areas. These factors determine the purpose of the establishment of planning and environment planning and information systems linked to strategic business planning. Table 2 shows the Pine Valley furniture pany39。s key planning a number of possible factors, these factors contribute to the information systems manager for the new information systems and databases clubs top priority to deal with the demand. For example, given the imprecise sales forecasts this problem areas, information systems managers in the organization may be stored in the database additional historical sales data, new market research data and new product test data. 2. The planning organizations set targets Organizations planning targets defined scope of business, and business scope will limit the subsequent analysis and information systems may change places. Five key planning targets as follows: ● organizational units in the various sectors. ● organizations location of the place of business operations. ● functions of the business support organizations handling mission of the relevant group. Unlike business organizations function modules, in fact a function can be assigned to various organizations modules (for example, product development function is the production and sale of the mon responsibility of the Ministry). ● types of entities managed by the organization on the people, places and things of the major types of data. ● Information System data set processing software applications and support procedures. 3. To set up a business model A prehensive business model including the functions of each enterprise functional deposition model, the enterprise data model and the various planning matrix. Functional deposition is the function of the organization for a more detailed deposition process, the functional deposition is to simplify the analysis of the issue,