Project dependencies are any tasks, events or situations that are either dependent on a previous completion of a task or on which a task is dependent on. It is the relationship between two separate activities within one larger project. Project dependencies can be internal, waiting on another dept to provide something to the project, they can also be external to the business and project. An external party could be providing or supplying goods for the project but are dependent on another third party to test and validate before they are released or delivered to the project.