Concept
The projects/plugins dependency diagram works at workspace level to display relationships between workspace projects
This diagram displays dependencies among projects with additional information such as the version requirement, if the declared dependency is really used, if the dependency is exported. Beside this feature the diagram can show information related to extension points implemented by plugins.
1. Open a projects/plugins dependency diagram
Right click one project/plugin in Package Explorer and select eDepend -> Plugin dependency explorer in popup menu

Then select the kind of link to display automatically and click the OK button

Two options in the checkboxes are Dependency and Extension.
- Dependency: If you select this option, it will show dependency relationship between elements automatically when create a diagram or insert elements
- Extension: If you select this option, it will show information related to extension points implemented by plugins automatically when create a diagram or insert projects
A plugin dependency diagram of org.talend.core has been opened

2. Open a projects/plugins unused dependency diagram
Right click one project/plugin in Package Explorer and select eDepend -> Plugin unused dependency explorer in popup menu

The next screenshot shows unused dependency between elements
