Software development projects IRSE buffer settings and simulation based on critical chain

Based on critical chain theory, this paper analyzes the software development projects for resource-constrained problems and gives solutions of them, suggests improved root square error (IRSE), the setting method of buffer sizes which is suitable for software development projects, and uses preemptive scheduling method based on heuristic algorithm and priority rules to plan the scheduling. The paper simulates the uncertainty of the project using computer simulation software. Comparing the result with traditional buffer setup method like cut and paste (C&P) and root square error (RSE) from two aspects, we find out that the IRSE buffer setup method can increase the buffer utilization rate while still maintains high stability which plays a direct positive effect in shortening the project duration.