Perception and Effective Communication in Witness Questioning

When a criminal justice practitioner questions a witness to a robbery, what influences the witness’s perspective on the situation?

When questioning a witness, why is it important for the criminal justice practitioner to understand that everyone sees situations from their own “lenses”?
Provide an example of a vague language question a police officer may ask a witness to a robbery.

Provide an example of the same question phrased without using vague language. Why is it important to use specific language when gathering information from a witness?