Describe the following problem

Problem- Imagine yourself as a human geographer who has been hired to design a new visitor map for your campus. You survey 100 students on campus and ask them to construct a personal mental map of the campus, including buildings and pathways.

Part 1- How can include both "too much" and "too little" information on a mental map compromise its usefulness to you?

I need help to explore the answer of the above problem and explain information on a mental map compromise its usefulness.