Over a period of 10 years, we have developed a sustainable process of online portfolio assessment that demonstrates both reliability and validity, using both qualitative and quantitative measures. The sustainable cycle is that, each semester, we assess a random sampling of the students' work that they have posted, as per our instructions, in an online portfolio. During the reading, the faculty
... [Show full abstract] score the documents for 11 variables, including writing, content, audience awareness, and document design. We achieved validity by a modi- fied online Delphi that led to a redefinition of the construct of technical communication itself; we achieved reliability by adjudication resulting in adjacent scores. The results of our assessment meet the requirements of ABET and result in a continual cycle of improvement for our technical communication curriculum. Results from three semesters show an improving correlation between the course grade and the overall, holistic portfolio score.