To realize the function of workflow management, the business process must be abstracted from the real world and described by a kind of formal method. 摘要为了实现工作流管理功能，必须将业务过程从现实世界中抽象出来，并用一种形式化方法对其进行描述。
The paper contributes to developing non-recursive algorithm using formal method and new strategy of developing loop invariant. 对使用形式化方法及循环不变式开发新策略开发非递归算法作了较深入的实践和探讨。
