This document provides a summary of a guest lecture on problems and challenges in engineering for good. It discusses several key challenges faced in Haiti after the 2010 earthquake, including widespread injuries, disease outbreaks, and lack of infrastructure. It then outlines some solutions proposed, such as using SMS and crowdsourcing to gather crisis information, providing free communication tools and financial services via mobile phones to help recovery efforts, and developing prevention tools like vaccines. It also addresses resources and considerations for developing mobile applications to aid in humanitarian crises.