Supporting the evolution of process model at run-time stage and propagating the changes of process model to the active process instances are fundamental requirements for any flexible process-aware information systems (PALS).Instance migration is regarded as the mainstream technique that deals with the dynamic evolution of process-aware information systems.By using this technique, active process instances are migrated to the modified process model, so that they can benefit from the optimization process.The challenges are 1) to guarantee that the process instances can be correctly migrated to the modified process model; 2) to efficiently check whether the process instances can be migrated.From this view, this paper surveys the state-of-the-art dynamic evolution of processes in PAIS.Finally, some potential research directions on evolution of processes are proposed for future references.%支持过程模型的动态修改并将过程模型的修改传播到当前正在运行的过程实例上,是柔性过程感知信息系统的基本要求.过程实例迁移是应对过程感知信息系统中过程动态演化的主流技术途径,它将尚未执行结束的过程实例动态地迁移到修改后的过程模型上继续执行,从而使得这些过程实例可以享受到过程优化带来的便利.过程实例迁移的挑战在于保证过程实例迁移的正确性以及过程实例迁移检验的高效性,以此为切入点,综述了过程感知信息系统中过程动态演化技术的研究进展.最后,展望了过程演化技术未来应当关注的研究方向.
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