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UML class diagram about relationship types in project management

I'm trying to draw an class diagram for my project management software describing the following. It contains the following classes:

  • Project - software projects
  • ProjectManager - he/she who manage the project
  • Employee - people who are engage in project work

and the following relationships/associations:

  1. a project manager may have to manage more than one project, while a project can only be managed by one project manager

  2. a project manager can assign an employee to a project that he/she manages

For the above associations I created this class diagram:

enter image description here

  • It's clear how to model the first association (between ProjectManager and Project)
  • I have no idea how to model the second association
    (how to implement that a project manager is only able to assign projects to employees that he is responsible to manage ?)
Solution

  • You just add an operation to Project called assignEmployee which will add the employee to its list of assigned employees:

    enter image description here

    It's unclear how an employee can be assigned, whether to just one or multiple projects. Also you will likely need a de-assign operation.

    Of course you can also use an association class like suggested by @WolfgangFahl.