1. Set boundaries. Tell your students exactly the amount of work you expect them to do.
  2. Set deadlines. Make sure your students understand the timing of their tasks.
  3. Enforce boundaries and deadlines. If you set them, live by them and mark by them.
  4. Make sure your students understand what tangible result they need to come up with. Is it a presentation? A bit of text? A wiki page? Does there need to be a link? An image? A video? Make sure they don't have such questions.
  5. Give an example of a completed task. It usually eliminates most questions.
  6. If your task can use templates, design those templates and teach your students to use them.
  7. Make sure your students understand how and where to mark their contributions and efforts. Always remind them to publish their works in their portfolios.
  8. Tackle the technical issues carefully, slowly and very thoroughly.

What to put in writing

It is not imperative that you follow all these guidelines as you set the task in writing, but make sure you cover everything during the class. If the task description is too long, you may end up confusing your students even further. As a rule of thumb, put in writing the deadlines, the restrictions and references, and keep everything else to class discussion and examples.