project与subject的区别：
project---作为项目时候，具有以下特征：
临时性的、一次性的。通常情况下，是有资源、成本、预算、时间上的约束几个条件为前提的。有清晰的截止日期，是具有实际成果并且可交付的短期目标。（Projects are temporary, one-off undertakings. They are generally bound by cost, resource, budget, and time constraints. Projects have clear end dates and short-term goals that give way to tangible outcomes or deliverables.）
program---作为项目时候，具有以下特征：
由基础的、相关联的project组成，这些 project 相互补充、依存建立，用以实现更大的、长期的业务目标。一个成功的program带来的是战略利益和组织成长，而不是单一的、有形的可交付成果。（Programs are composed of several underlying, interconnected projects. These projects complement and build off one another to achieve a larger, long-term business objective. A successful program drives strategic benefits and organizational growth, rather than a single, tangible deliverable.）
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