graph TD A(假设日志) B(干系人登记册) C(项目章程) D(沟通计划) subgraph S1 [第一阶段] direction LR A --> C B --> C end

graph TD %% --- 阶段一模块 --- subgraph S1 [第一阶段] direction TB A[第一步: 建章立制]:::mainNode A --> A1[发布管理纲领]:::subNode A --> A2[组建核心团队]:::subNode A --> A3[上线统一工具]:::subNode end %% --- 阶段二模块 --- subgraph S2 [第二阶段] direction TB B[第二步: 分类治理]:::mainNode B --> B1[项目分级 A/B/C]:::subNode B --> B2[A类项目直管]:::subNode B --> B3[建立监控体系]:::subNode end %% --- 阶段三模块 --- subgraph S3 [第三阶段] direction TB C[第三步: 价值驱动]:::mainNode C --> C1[启动组合管理]:::subNode C --> C2[收益追踪与分析]:::subNode C --> C3[PMO价值量化报告]:::subNode end %% --- 核心演进主线 --- %% 将箭头放在右侧，形成清晰的向下流向 A -.->|制度发布| B B -.->|体系运行| C