For the past year, Trinity College has utilized Sahana, a free and open source disaster management system, as a foundation to teach software engineering. The goals of the use of the Sahana project are threefold: to provide students with a real-world software engineering experience; to introduce students to the open-source development model; and to attract a wider variety of students into computing due to the real-world and humanitarian nature of the Sahana project. This paper discusses an approach for using open source software as a foundation to teach software engineering in a Liberal Arts environment by involving students in an ongoing, real-world project from the very beginning, allowing students with a wide range of backgrounds to participate. Results of a learning survey of a small group of students who have participated in the project are presented. The paper also provides guidance to others contemplating incorporating open source projects into their software engineering courses or curriculum.

The Mobile CS Principles (Mobile CSP) course is one of the NSFsupported, College Board-endorsed curricula for the new Computer Science Principles AP course. Since 2013, the Mobile CSP project has trained more than 700 teachers, and the course has been offered to more than 20,000 students throughout the United States. The organizing philosophy behind the Mobile CSP course is that student engagement in the classroom is the key to getting students, especially those traditionally underrepresented in CS, interested in pursuing further study and careers in CS. The main strategies used to engage Mobile CSP students are: (1) a focus on mobile computing throughout the course, taking advantage of current student interest in smartphones; (2) an emphasis on getting students building mobile apps from day one, by utilizing the highly accessible App Inventor programming language; and (3) an emphasis on building creative, 'socially useful' apps to get students thinking about ways that computing can help their communities. In this paper we present and summarize two years of data of various types (i.e., student surveys, teacher surveys, objective assessments, and anecdotal reports from students and teachers) to support the hypothesis that engagement of the sort practiced in the Mobile CSP course not only helps broaden participation in CS among hard-to-reach demographics, but also provides them with a solid grounding in computer science principles and practices. CCS CONCEPTS • Social and professional topics → Computing education; • Software and its engineering → Visual languages;

The humanitarian focus of socially useful projects promises to motivate community-minded undergrads in and out of CS.

In this paper, we present an example humanitarian open-source software project that has been used since January 2006 at a small liberal-arts college as an experiment in undergraduate CS education. Sahana (Sinhalese for relief) is a free and open-source disaster management system developed in Sri Lanka by a group of IT professionals following the 2004 Asian tsunami. It is a webbased tool that addresses the IT coordination problems that typically occur in trying to recover from a large-scale disaster. We are currently exploring the wider use of Sahana as a sustainable model and platform for teaching about open-source software development while at the same time allowing CS students and educators to make a socially useful contribution of their time, effort, and expertise. This paper presents our experiences with Sahana including the benefits for both academia and industry.

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