Introduction to Usablity Test Facilitation - Paper Prototyping: The Fast and Easy Way to Define and Refine User Interfaces - page 132

Facilitator Responsibilities
Here's an overview of the activities typically performed by the usability test facilitator:
Before the users arrive, brief the in-room observers on how to behave, what to watch for, and how
to take notes ( Chapters 10 and 11 discuss this further).
Greet the users, brief them, obtain their informed consent, and pay them.
Escort users to the test room and introduce them to the Computer and any observers.
Ask users to introduce themselves and summarize their background.
Explain the testing protocol—how to interact with the paper prototype, work together, think aloud,
and so on.
Facilitate each task, interacting with users as needed.
Manage the time spent on each task, covering the areas that are of greatest interest to the
observers.
(Optional) Facilitate a short Q&A session with the users (and observers, if present) to discuss
interesting issues that arose during the session or ask questions not covered by the tasks.
End the session on time.
Thank the users and escort them out.
Debrief the observers—list issues and make changes to the prototype in time for the next test.
(This can be done by a core team member instead of the facilitator.)