Task 5 Directions：The following is a list of terms used on the internet．(下略) A—Preface B—Work Breakdown Structure C—Product-oriented WBS Tabular Format D—Advantages and Disadvantages of the Product-oriented WBS E—Task-oriented WBS Tabular Format F—Cost Estimation G—Scheduling Tools H—Cost Management Tools I—Key Cost Estimating Concepts J—Projecting and Tracking Budgets K—Financial Analysis Concepts and Tools L—Opportunity Cost Concept M—Discounted Cash Flows N—Internal Rate of Return O—Conclusion ( )内部收益率 ( )机会成本概念