Reanalysis of the questions I posted before. 1. B (Very easy, a communication system is needed to reduce the impact caused by cultural difference for an international project). 2. C ("Commitment" is a special term often used in contract related documents. A purchase order is a commitment to exchange a certain quantity/quality of product at a certain price at some time. ) 3. A (The question tests that the develop project charter process shall be revisited at the beginning of the subsequent project phases. However, instead of "obtain a charter for each phase", I think it is better phrased as "update the project charter".) 4. C (This question is out of date, for PMBOK 2000, so no need to care about this question.)