数据字典是各类数据描述的集合，它通常包括5个部分，即数据项、数据结构、数据流、______和处理过程。
参考答案：数据存储
解析： 数据库设计方法和步骤
[评析] 数据字典是各类数据描述的集合，它通常包括5个部分，即数据项，是数据的最小单位，数据结构，是若干数据项有意义的集合；数据流，可以是数据项，也可以是数据结构，表示某一处理过程的输入或输出：数据存储，处理过程中存取的数据，常常是下手工凭证、手工文档或计算机文件：处理过程。
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