In Galactic Exchange we tell the students that you find yourself on another planet and that you have to solve a problem.
The Rationale Behind the Feature (Specific Design Principle):
Using second person (e.g., you) in task description engages the student (e.g., Alice). The task should ask the student to solve a problem not for a third person, but for him or herself. Therefore, the wording of the task should be such that it is describing a problem for the student to solve, and not describing someone elses problem.
Context of Use:
Example: You find yourself on another planet; Not Alice shows up on another planet.
Student is engaged. Student finishes the problem. Evidence of reasoning, rather than random tries to solve the problem.