单选题 A project management technique that is currently in widespread use is the ______. The purpose of this technique is to detail, in hierarchical fashion, all of the activities that are required to meet project objectives. There are some special activities called ______, which are events that signify the accomplishment or completion of major deliverables during the project. Most system development methodologies also provide ______, whose purpose is to contain the various pieces of relevant information-feasibility assessments, schedules, needs analysis, and so forth-in a single place so that they can be presented to project clients and other related parties. Several types of important network diagrams are used in project management. ______was developed to make clear the interdependence between project tasks before those tasks are scheduled. ______ offers the advantage of clearly showing overlapping tasks.