After acceptance and formal transfer of information systems to customers it has entered the stage of （）
- A.preparation
- B.operation and maintenance
- C.development
- D.extinction
正确答案及解析
正确答案
解析
信息系统的生命周期可以简化为系统规划、系统分析、系统设计、系统实施、运行维护等阶段。
系统规划：该阶段任务是对组织的环境、目标及现行系统的状况进行初步调查，根据组织目标和发展战略，确定信息系统的发展战略，对建设新系统的需求做出分析和预测，同时考虑建设新系统所受的各种约束，研究建设新系统的必要性和可能性。
系统分析：根据系统设计任务书所确定的范围，对现行系统进行详细调查，描述现行系统的业务流程，指出现行系统的局限性和不足之处，确定新系统的基本目标和逻辑功能要求，即提出新系统的逻辑模型。
系统设计：该阶段是具体设计实现逻辑模型的技术方案，也就是设计新系统的物理模型。
系统设施：将设计的系统付诸实施的阶段。
系统运行和维护阶段：系统投入运行后，需要经常进行维护和评价，记录系统运行的情况，根据一定的规则对系统进行必要的修改，评价系统的工作质量和经济效益。
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