I found digitizing attendance data to be a cumbersome part of an instructors role. I developed a product concept to fulfill my own needs for taking classroom attendance, attendance-based automated reminders, and splitting a class into groups.
A colleague of mine developed, based on this product concept, an Android app to learn Android development. As a paid app, it gained over 800 purchases with zero marketing effort. The free, feature-limited version of the same app gained over 8,000 device installs in three years and three months, also involving zero marketing. Scope: requirements analysis, information architecture, usability testing, interface design. // July 2010