Specification
A project is used to describe a type of group of tasks, For instance if there is a weekly meeting discussing a nonprofits status, we might have a project called weekly status.
A discussion is a specific instance of project, taken the example above the discussion would be weekly status 5/4/2015 - it would be instantiated in the date 5/4/2015, with a set number of attendees. Typically a set of tasks will be created or discussed in a discussion.
Tasks are part of discussions and have state, information and referenced documents. In any given time there is one person assigned responsibility to a task.
People can follow tasks/discussions/projects and documents.