原因是专案通常具独一性、复杂性、有其假设与限制，并牵涉许多不同程度的利益关系人，且专案成败取决于人员绩效。
This is because they are usually unique and complex, based on assumptions and constraints, with a range of stakeholders, and dependent on the performance of people.
项目假定与约束条件（说明项目的主要假设条件和限制性条件） V。
Project assumptions and constraints (to describe the main project assumptions and the ?
项目假定与约束条件（说明项目的主要假设条件和限制性条件） V。
Project assumptions and constraints (to describe the main project assumptions and the ?
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