The Agricultural and Biosystems Engineering (ABE) Learning Community is using electronic portfolios (ePortfolios) for developing and assessing student competencies. These competencies are part of the Iowa State University's (ISU) College of Engineering competency-based assessment program for ABET student outcomes. ABE students in their second semester English composition (rhetoric) course (exclusive to ABE Learning Community students) use electronic portfolios to present arguments on issues relevant to engineering and agriculture. This paper will discuss the extensive collaboration between the English instructor and ABE faculty in constructing the course objectives and syllabus, the process by which ABE students create their ePortfolios, how the ePortfolios are assessed, and how ePortfolios contribute to the development of ABET-aligned competencies.