Considering the peculiar characteristics of industries, the researchers found that the purchasing and expenditure cycle is the more consistent internal control system cycle. It was further found that firms can further create additional value by acquiring the product and labor for reasonable prices. Li and Lin (2004) support the claim that purchasing and expenditure is one key cycle affecting corporate performance. Therefore, this study treats the purchasing and expenditure cycle as an important example for a computing-auditing system development. Ma (2006), Romney and Steinbart (2006) and Wu (2007) have similar definition on the purchasing and expenditure cycle and its view of control items (see Table 1).