This document provides information for mentors of the ENGR 245 course at Stanford University. It outlines the course goals of teaching students how to build venture-scale businesses through customer development and testing business model hypotheses. It describes the student teams, 10-week schedule, and expectations for mentors to meet with their assigned student team every two weeks to provide guidance. Mentors are asked to help students select viable business opportunities and get experience validating their ideas with customers.