The document provides a program report for Collaborate for Social Impact (C4SI) in 2015. C4SI is an annual experiential educational program run by Just Innovate that brings together 47 students from diverse backgrounds to develop innovative solutions to 11 social challenges. Over the course of 8 weeks, students participated in workshops on topics like human-centered design, team dynamics, and pitching. Students worked in teams and received mentorship to develop 11 social innovations, which they pitched at a final Demo Day event. The program aimed to foster creativity, collaboration, and social change among student communities.