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Recently, some techniques for a very short-period software development which is called “Agile” have been proposed. In order to avoid risks, it has been considered as a taboo that the Post-work is started before the Pre-work is completed. However, we might have to break a taboo to recover a process delay. Therefore, this paper proposes a method to make a successful schedule plan automatically. The process delay can be recovered by breaking the taboo. This paper also proposes a method which is able to make a countermeasure plan automatically against a process delay by means of 'Fast-Tracking', and finally proves that our method is effective in a software project management by showing an example of the system.