Abstract: The paper introduced complex network theories into project portfolio management, take projects as nodes, the relationships among the projects as edges, and the cost as node weight, the tightness of the projects as edge weight, The poject portfolio is then generalized as a weighted complex network. The papers studied project portfolio network of four enterprises, and sumerized the behavior characteristics on the basis of analysing the project portfolio. Through comparative analysis, the paper discovered these similarity characteristics: ①Degree distribution of the node differs from that of other society networks, it tends to be power-law, while also seems to follow skewed poisson distribution; ②Relative coefficient of the degree is negetive, which also differs from other society networks; Project portfolio enjoys cluster structure; ④Accumulation coefficient is large; ⑤Network diameter is small; ⑥the average degree is less than four.

Key words: project management, complex network, project portfolio, project cluster.

摘要： 将复杂网络理论引入到项目组合管理中,以项目为节点,以项目之间的依赖关系为边,项目的成本看作点权,项目之间的依赖强度看作边权,将项目组合抽象为一个复杂加权网络。研究了4家企业的项目组合网络,在分析项目组合特性的基础上,概括了项目组合的复杂网络行为特征。对企业项目组合网络进行综合对比分析发现,项目组合网络具有如下相似特征:①节点度分布不同于其他社会网络,倾向于幂律分布,又有偏斜泊松分布的迹象;②度相关系数负相关,有别于其他社会网络;③具有集群结构;④聚集系数很大;⑤网络直径较小;⑥平均度数小于4。

关键词: 项目管理, 复杂网络, 项目组合, 项目群.